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受欢迎的三角函数 >

sin(2x+15)=cos(1/2 x-15)

解答

sin (2 x + 1 5^{\circ}) = cos (\frac{1}{2} x - 1 5^{\circ})

解答

x \in R 无解

求解步骤

sin (2 x + 1 5^{\circ}) = cos (\frac{1}{2} x - 1 5^{\circ})

使用三角恒等式改写

sin (2 x + 1 5^{\circ}) = cos (\frac{1}{2} x - 1 5^{\circ})

利用以下特性:

cos (x) = sin (9 0^{\circ} - x)

sin (2 x + 1 5^{\circ}) = sin (9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ}))

sin (2 x + 1 5^{\circ}) = sin (9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ}))

使用反三角函数性质

sin (2 x + 1 5^{\circ}) = sin (9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ}))

sin (x) = sin (y) \Rightarrow x = y + 2 π n, x = π - y + 2 π n

2 x + 1 5^{\circ} = 9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ}) + 36 0^{\circ} n, 2 x + 1 5^{\circ} = 18 0^{\circ} - (9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ})) + 36 0^{\circ} n

2 x + 1 5^{\circ} = 9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ}) + 36 0^{\circ} n, 2 x + 1 5^{\circ} = 18 0^{\circ} - (9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ})) + 36 0^{\circ} n

2 x + 1 5^{\circ} = 9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ}) + 36 0^{\circ} n : x = \frac{72 0 ^{\circ} n + 18 0 ^{\circ}}{5}

2 x + 1 5^{\circ} = 9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ}) + 36 0^{\circ} n

展开

9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ}) + 36 0^{\circ} n : 36 0^{\circ} n - \frac{x}{2} + 10 5^{\circ}

9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ}) + 36 0^{\circ} n

- (\frac{1}{2} x - 1 5^{\circ}) : - \frac{1}{2} x + 1 5^{\circ}

- (\frac{1}{2} x - 1 5^{\circ})

打开括号

= - (\frac{1}{2} x) - (- 1 5^{\circ})

使用加减运算法则

- (- a) = a, - (a) = - a

= - \frac{1}{2} x + 1 5^{\circ}

= 9 0^{\circ} - \frac{1}{2} x + 1 5^{\circ} + 36 0^{\circ} n

化简

9 0^{\circ} - \frac{1}{2} x + 1 5^{\circ} + 36 0^{\circ} n : 36 0^{\circ} n + \frac{- 6 x + 126 0 ^{\circ}}{12}

9 0^{\circ} - \frac{1}{2} x + 1 5^{\circ} + 36 0^{\circ} n

对同类项分组

= - \frac{1}{2} x + 36 0^{\circ} n + 9 0^{\circ} + 1 5^{\circ}

乘

\frac{1}{2} x : \frac{x}{2}

\frac{1}{2} x

分式相乘:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{1 \cdot x}{2}

乘以:

1 \cdot x = x

= \frac{x}{2}

= - \frac{x}{2} + 36 0^{\circ} n + 9 0^{\circ} + 1 5^{\circ}

2, 2, 12

的最小公倍数:

12

2, 2, 12

最小公倍数 (LCM)

2

质因数分解:

2

2

2

是质数，因此无法因数分解

= 2

2

质因数分解:

2

2

2

是质数，因此无法因数分解

= 2

12

质因数分解:

2 \cdot 2 \cdot 3

12

12

除以

212 = 6 \cdot 2

= 2 \cdot 6

6

除以

26 = 3 \cdot 2

= 2 \cdot 2 \cdot 3

2, 3

都是质数，因此无法进一步因数分解

= 2 \cdot 2 \cdot 3

计算出由至少在以下一个数字中出现的因数组成的数字:

2, 2, 12

= 2 \cdot 2 \cdot 3

数字相乘:

2 \cdot 2 \cdot 3 = 12

= 12

根据最小公倍数调整分式

将每个分子乘以其分母转变为最小公倍数所要乘以的同一数值

12

对于

\frac{x}{2} :

将分母和分子乘以

6

\frac{x}{2} = \frac{x \cdot 6}{2 \cdot 6} = \frac{x \cdot 6}{12}

对于

9 0^{\circ} :

将分母和分子乘以

6

9 0^{\circ} = \frac{18 0 ^{\circ} 6}{2 \cdot 6} = 9 0^{\circ}

= - \frac{x \cdot 6}{12} + 9 0^{\circ} + 1 5^{\circ}

因为分母相等，所以合并分式:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{- x \cdot 6 + 18 0 ^{\circ} 6 + 18 0 ^{\circ}}{12}

同类项相加:

108 0^{\circ} + 18 0^{\circ} = 126 0^{\circ}

= 36 0^{\circ} n + \frac{- 6 x + 126 0 ^{\circ}}{12}

= 36 0^{\circ} n + \frac{- 6 x + 126 0 ^{\circ}}{12}

使用分式法则:

\frac{a \pm b}{c} = \frac{a}{c} \pm \frac{b}{c}

\frac{- x \cdot 6 + 126 0 ^{\circ}}{12} = - \frac{x \cdot 6}{12} + 10 5^{\circ}

= 36 0^{\circ} n - \frac{6 x}{12} + 10 5^{\circ}

消掉

\frac{x \cdot 6}{12} : \frac{x}{2}

\frac{x \cdot 6}{12}

约分:

6

= \frac{x}{2}

= 36 0^{\circ} n - \frac{x}{2} + 10 5^{\circ}

2 x + 1 5^{\circ} = 36 0^{\circ} n - \frac{x}{2} + 10 5^{\circ}

将

1 5^{\circ}

到右边

2 x + 1 5^{\circ} = 36 0^{\circ} n - \frac{x}{2} + 10 5^{\circ}

两边减去

1 5^{\circ}

2 x + 1 5^{\circ} - 1 5^{\circ} = 36 0^{\circ} n - \frac{x}{2} + 10 5^{\circ} - 1 5^{\circ}

化简

2 x + 1 5^{\circ} - 1 5^{\circ} = 36 0^{\circ} n - \frac{x}{2} + 10 5^{\circ} - 1 5^{\circ}

化简

2 x + 1 5^{\circ} - 1 5^{\circ} : 2 x

2 x + 1 5^{\circ} - 1 5^{\circ}

同类项相加:

1 5^{\circ} - 1 5^{\circ} = 0

= 2 x

化简

36 0^{\circ} n - \frac{x}{2} + 10 5^{\circ} - 1 5^{\circ} : 36 0^{\circ} n + \frac{- x + 18 0 ^{\circ}}{2}

36 0^{\circ} n - \frac{x}{2} + 10 5^{\circ} - 1 5^{\circ}

合并分式

10 5^{\circ} - 1 5^{\circ} : 9 0^{\circ}

使用法则

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{126 0 ^{\circ} - 18 0 ^{\circ}}{12}

同类项相加:

126 0^{\circ} - 18 0^{\circ} = 108 0^{\circ}

= 9 0^{\circ}

约分:

6

= 9 0^{\circ}

= 36 0^{\circ} n - \frac{x}{2} + 9 0^{\circ}

因为分母相等，所以合并分式:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= 36 0^{\circ} n + \frac{- x + 18 0 ^{\circ}}{2}

2 x = 36 0^{\circ} n + \frac{- x + 18 0 ^{\circ}}{2}

2 x = 36 0^{\circ} n + \frac{- x + 18 0 ^{\circ}}{2}

2 x = 36 0^{\circ} n + \frac{- x + 18 0 ^{\circ}}{2}

在两边乘以

2

2 x = 36 0^{\circ} n + \frac{- x + 18 0 ^{\circ}}{2}

在两边乘以

2

2 x \cdot 2 = 36 0^{\circ} n \cdot 2 + \frac{- x + 18 0 ^{\circ}}{2} \cdot 2

化简

2 x \cdot 2 = 36 0^{\circ} n \cdot 2 + \frac{- x + 18 0 ^{\circ}}{2} \cdot 2

化简

2 x \cdot 2 : 4 x

2 x \cdot 2

数字相乘:

2 \cdot 2 = 4

= 4 x

化简

36 0^{\circ} n \cdot 2 : 72 0^{\circ} n

36 0^{\circ} n \cdot 2

数字相乘:

2 \cdot 2 = 4

= 72 0^{\circ} n

化简

\frac{- x + 18 0 ^{\circ}}{2} \cdot 2 : - x + 18 0^{\circ}

\frac{- x + 18 0 ^{\circ}}{2} \cdot 2

分式相乘:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{( - x + 18 0 ^{\circ} ) \cdot 2}{2}

约分:

2

= - - x + 18 0^{\circ}

4 x = 72 0^{\circ} n - x + 18 0^{\circ}

4 x = 72 0^{\circ} n - x + 18 0^{\circ}

4 x = 72 0^{\circ} n - x + 18 0^{\circ}

将

x

para o lado esquerdo

4 x = 72 0^{\circ} n - x + 18 0^{\circ}

两边加上

x

4 x + x = 72 0^{\circ} n - x + 18 0^{\circ} + x

化简

5 x = 72 0^{\circ} n + 18 0^{\circ}

5 x = 72 0^{\circ} n + 18 0^{\circ}

两边除以

5

5 x = 72 0^{\circ} n + 18 0^{\circ}

两边除以

5

\frac{5 x}{5} = \frac{72 0 ^{\circ} n}{5} + 3 6^{\circ}

化简

\frac{5 x}{5} = \frac{72 0 ^{\circ} n}{5} + 3 6^{\circ}

化简

\frac{5 x}{5} : x

\frac{5 x}{5}

数字相除:

\frac{5}{5} = 1

= x

化简

\frac{72 0 ^{\circ} n}{5} + 3 6^{\circ} : \frac{72 0 ^{\circ} n + 18 0 ^{\circ}}{5}

\frac{72 0 ^{\circ} n}{5} + 3 6^{\circ}

使用法则

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{72 0 ^{\circ} n + 18 0 ^{\circ}}{5}

x = \frac{72 0 ^{\circ} n + 18 0 ^{\circ}}{5}

x = \frac{72 0 ^{\circ} n + 18 0 ^{\circ}}{5}

x = \frac{72 0 ^{\circ} n + 18 0 ^{\circ}}{5}

2 x + 1 5^{\circ} = 18 0^{\circ} - (9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ})) + 36 0^{\circ} n : x = \frac{36 0 ^{\circ} + 216 0 ^{\circ} n}{9}

2 x + 1 5^{\circ} = 18 0^{\circ} - (9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ})) + 36 0^{\circ} n

展开

18 0^{\circ} - (9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ})) + 36 0^{\circ} n : 18 0^{\circ} + \frac{x}{2} - 10 5^{\circ} + 36 0^{\circ} n

18 0^{\circ} - (9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ})) + 36 0^{\circ} n

乘开

9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ}) : \frac{- x \cdot 6 + 126 0 ^{\circ}}{12}

9 0^{\circ} - (\frac{1}{2} x - 1 5^{\circ})

- (\frac{1}{2} x - 1 5^{\circ}) : - \frac{1}{2} x + 1 5^{\circ}

- (\frac{1}{2} x - 1 5^{\circ})

打开括号

= - (\frac{1}{2} x) - (- 1 5^{\circ})

使用加减运算法则

- (- a) = a, - (a) = - a

= - \frac{1}{2} x + 1 5^{\circ}

= 9 0^{\circ} - \frac{1}{2} x + 1 5^{\circ}

化简

9 0^{\circ} - \frac{1}{2} x + 1 5^{\circ} : \frac{- 6 x + 126 0 ^{\circ}}{12}

9 0^{\circ} - \frac{1}{2} x + 1 5^{\circ}

对同类项分组

= - \frac{1}{2} x + 9 0^{\circ} + 1 5^{\circ}

乘

\frac{1}{2} x : \frac{x}{2}

\frac{1}{2} x

分式相乘:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{1 \cdot x}{2}

乘以:

1 \cdot x = x

= \frac{x}{2}

= - \frac{x}{2} + 9 0^{\circ} + 1 5^{\circ}

2, 2, 12

的最小公倍数:

12

2, 2, 12

最小公倍数 (LCM)

2

质因数分解:

2

2

2

是质数，因此无法因数分解

= 2

2

质因数分解:

2

2

2

是质数，因此无法因数分解

= 2

12

质因数分解:

2 \cdot 2 \cdot 3

12

12

除以

212 = 6 \cdot 2

= 2 \cdot 6

6

除以

26 = 3 \cdot 2

= 2 \cdot 2 \cdot 3

2, 3

都是质数，因此无法进一步因数分解

= 2 \cdot 2 \cdot 3

计算出由至少在以下一个数字中出现的因数组成的数字:

2, 2, 12

= 2 \cdot 2 \cdot 3

数字相乘:

2 \cdot 2 \cdot 3 = 12

= 12

根据最小公倍数调整分式

将每个分子乘以其分母转变为最小公倍数所要乘以的同一数值

12

对于

\frac{x}{2} :

将分母和分子乘以

6

\frac{x}{2} = \frac{x \cdot 6}{2 \cdot 6} = \frac{x \cdot 6}{12}

对于

9 0^{\circ} :

将分母和分子乘以

6

9 0^{\circ} = \frac{18 0 ^{\circ} 6}{2 \cdot 6} = 9 0^{\circ}

= - \frac{x \cdot 6}{12} + 9 0^{\circ} + 1 5^{\circ}

因为分母相等，所以合并分式:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{- x \cdot 6 + 18 0 ^{\circ} 6 + 18 0 ^{\circ}}{12}

同类项相加:

108 0^{\circ} + 18 0^{\circ} = 126 0^{\circ}

= \frac{- 6 x + 126 0 ^{\circ}}{12}

= \frac{- 6 x + 126 0 ^{\circ}}{12}

= 18 0^{\circ} - \frac{- 6 x + 126 0 ^{\circ}}{12} + 36 0^{\circ} n

使用分式法则:

\frac{a \pm b}{c} = \frac{a}{c} \pm \frac{b}{c}

\frac{- x \cdot 6 + 126 0 ^{\circ}}{12} = - (- \frac{x \cdot 6}{12}) - (10 5^{\circ})

= 18 0^{\circ} - (- \frac{6 x}{12}) - (10 5^{\circ}) + 36 0^{\circ} n

去除括号:

(a) = a, - (- a) = a

= 18 0^{\circ} + \frac{x \cdot 6}{12} - 10 5^{\circ} + 36 0^{\circ} n

消掉

\frac{x \cdot 6}{12} : \frac{x}{2}

\frac{x \cdot 6}{12}

约分:

6

= \frac{x}{2}

= 18 0^{\circ} + \frac{x}{2} - 10 5^{\circ} + 36 0^{\circ} n

2 x + 1 5^{\circ} = 18 0^{\circ} + \frac{x}{2} - 10 5^{\circ} + 36 0^{\circ} n

将

1 5^{\circ}

到右边

2 x + 1 5^{\circ} = 18 0^{\circ} + \frac{x}{2} - 10 5^{\circ} + 36 0^{\circ} n

两边减去

1 5^{\circ}

2 x + 1 5^{\circ} - 1 5^{\circ} = 18 0^{\circ} + \frac{x}{2} - 10 5^{\circ} + 36 0^{\circ} n - 1 5^{\circ}

化简

2 x + 1 5^{\circ} - 1 5^{\circ} = 18 0^{\circ} + \frac{x}{2} - 10 5^{\circ} + 36 0^{\circ} n - 1 5^{\circ}

化简

2 x + 1 5^{\circ} - 1 5^{\circ} : 2 x

2 x + 1 5^{\circ} - 1 5^{\circ}

同类项相加:

1 5^{\circ} - 1 5^{\circ} = 0

= 2 x

化简

18 0^{\circ} + \frac{x}{2} - 10 5^{\circ} + 36 0^{\circ} n - 1 5^{\circ} : \frac{x}{2} + 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ}

18 0^{\circ} + \frac{x}{2} - 10 5^{\circ} + 36 0^{\circ} n - 1 5^{\circ}

对同类项分组

= \frac{x}{2} + 18 0^{\circ} + 36 0^{\circ} n - 1 5^{\circ} - 10 5^{\circ}

合并分式

- 1 5^{\circ} - 10 5^{\circ} : - 12 0^{\circ}

使用法则

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{- 18 0 ^{\circ} - 126 0 ^{\circ}}{12}

同类项相加:

- 18 0^{\circ} - 126 0^{\circ} = - 144 0^{\circ}

= \frac{- 144 0 ^{\circ}}{12}

使用分式法则:

\frac{- a}{b} = - \frac{a}{b}

= - 12 0^{\circ}

约分:

4

= - 12 0^{\circ}

= \frac{x}{2} + 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ}

2 x = \frac{x}{2} + 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ}

2 x = \frac{x}{2} + 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ}

2 x = \frac{x}{2} + 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ}

将

\frac{x}{2}

para o lado esquerdo

2 x = \frac{x}{2} + 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ}

两边减去

\frac{x}{2}

2 x - \frac{x}{2} = \frac{x}{2} + 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ} - \frac{x}{2}

化简

2 x - \frac{x}{2} = \frac{x}{2} + 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ} - \frac{x}{2}

化简

2 x - \frac{x}{2} : \frac{3 x}{2}

2 x - \frac{x}{2}

将项转换为分式:

2 x = \frac{2 x 2}{2}

= - \frac{x}{2} + \frac{2 x \cdot 2}{2}

因为分母相等，所以合并分式:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{- x + 2 x \cdot 2}{2}

- x + 2 x \cdot 2 = 3 x

- x + 2 x \cdot 2

数字相乘:

2 \cdot 2 = 4

= - x + 4 x

同类项相加:

- x + 4 x = 3 x

= 3 x

= \frac{3 x}{2}

化简

\frac{x}{2} + 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ} - \frac{x}{2} : 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ}

\frac{x}{2} + 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ} - \frac{x}{2}

同类项相加:

\frac{x}{2} - \frac{x}{2} = 0

= 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ}

\frac{3 x}{2} = 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ}

\frac{3 x}{2} = 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ}

\frac{3 x}{2} = 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ}

在两边乘以

2

\frac{3 x}{2} = 18 0^{\circ} + 36 0^{\circ} n - 12 0^{\circ}

在两边乘以

2

\frac{2 \cdot 3 x}{2} = 36 0^{\circ} + 2 \cdot 36 0^{\circ} n - 2 \cdot 12 0^{\circ}

化简

\frac{2 \cdot 3 x}{2} = 36 0^{\circ} + 2 \cdot 36 0^{\circ} n - 2 \cdot 12 0^{\circ}

化简

\frac{2 \cdot 3 x}{2} : 3 x

\frac{2 \cdot 3 x}{2}

数字相乘:

2 \cdot 3 = 6

= \frac{6 x}{2}

数字相除:

\frac{6}{2} = 3

= 3 x

化简

36 0^{\circ} + 2 \cdot 36 0^{\circ} n - 2 \cdot 12 0^{\circ} : 36 0^{\circ} + 72 0^{\circ} n - 24 0^{\circ}

36 0^{\circ} + 2 \cdot 36 0^{\circ} n - 2 \cdot 12 0^{\circ}

2 \cdot 36 0^{\circ} n = 72 0^{\circ} n

2 \cdot 36 0^{\circ} n

数字相乘:

2 \cdot 2 = 4

= 72 0^{\circ} n

2 \cdot 12 0^{\circ} = 24 0^{\circ}

2 \cdot 12 0^{\circ}

分式相乘:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= 24 0^{\circ}

数字相乘:

2 \cdot 2 = 4

= 24 0^{\circ}

= 36 0^{\circ} + 72 0^{\circ} n - 24 0^{\circ}

3 x = 36 0^{\circ} + 72 0^{\circ} n - 24 0^{\circ}

3 x = 36 0^{\circ} + 72 0^{\circ} n - 24 0^{\circ}

3 x = 36 0^{\circ} + 72 0^{\circ} n - 24 0^{\circ}

两边除以

3

3 x = 36 0^{\circ} + 72 0^{\circ} n - 24 0^{\circ}

两边除以

3

\frac{3 x}{3} = 12 0^{\circ} + \frac{72 0 ^{\circ} n}{3} - \frac{24 0 ^{\circ}}{3}

化简

\frac{3 x}{3} = 12 0^{\circ} + \frac{72 0 ^{\circ} n}{3} - \frac{24 0 ^{\circ}}{3}

化简

\frac{3 x}{3} : x

\frac{3 x}{3}

数字相除:

\frac{3}{3} = 1

= x

化简

12 0^{\circ} + \frac{72 0 ^{\circ} n}{3} - \frac{24 0 ^{\circ}}{3} : \frac{36 0 ^{\circ} + 216 0 ^{\circ} n}{9}

12 0^{\circ} + \frac{72 0 ^{\circ} n}{3} - \frac{24 0 ^{\circ}}{3}

使用法则

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{36 0 ^{\circ} + 72 0 ^{\circ} n - 24 0 ^{\circ}}{3}

化简

36 0^{\circ} + 72 0^{\circ} n - 24 0^{\circ} : \frac{36 0 ^{\circ} + 216 0 ^{\circ} n}{3}

36 0^{\circ} + 72 0^{\circ} n - 24 0^{\circ}

将项转换为分式:

36 0^{\circ} = 36 0^{\circ}, 72 0^{\circ} n = \frac{72 0 ^{\circ} n 3}{3}

= 36 0^{\circ} + \frac{72 0 ^{\circ} n \cdot 3}{3} - 24 0^{\circ}

因为分母相等，所以合并分式:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{36 0 ^{\circ} 3 + 72 0 ^{\circ} n \cdot 3 - 72 0 ^{\circ}}{3}

36 0^{\circ} 3 + 72 0^{\circ} n \cdot 3 - 72 0^{\circ} = 36 0^{\circ} + 216 0^{\circ} n

36 0^{\circ} 3 + 72 0^{\circ} n \cdot 3 - 72 0^{\circ}

数字相乘:

2 \cdot 3 = 6

= 108 0^{\circ} + 4 \cdot 54 0^{\circ} n - 72 0^{\circ}

数字相乘:

4 \cdot 3 = 12

= 108 0^{\circ} + 216 0^{\circ} n - 72 0^{\circ}

对同类项分组

= 108 0^{\circ} - 72 0^{\circ} + 216 0^{\circ} n

同类项相加:

108 0^{\circ} - 72 0^{\circ} = 36 0^{\circ}

= 36 0^{\circ} + 216 0^{\circ} n

= \frac{36 0 ^{\circ} + 216 0 ^{\circ} n}{3}

= \frac{\frac{36 0 ^{\circ} + 216 0 ^{\circ} n}{3}}{3}

使用分式法则:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{36 0 ^{\circ} + 216 0 ^{\circ} n}{3 \cdot 3}

数字相乘:

3 \cdot 3 = 9

= \frac{36 0 ^{\circ} + 216 0 ^{\circ} n}{9}

x = \frac{36 0 ^{\circ} + 216 0 ^{\circ} n}{9}

x = \frac{36 0 ^{\circ} + 216 0 ^{\circ} n}{9}

x = \frac{36 0 ^{\circ} + 216 0 ^{\circ} n}{9}

因为方程对以下值无定义:

\frac{72 0 ^{\circ} n + 18 0 ^{\circ}}{5}, \frac{36 0 ^{\circ} + 216 0 ^{\circ} n}{9}

x \in R 无解

作图

流行的例子

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8cos^2(x)-2cos(x)-1=0

8 cos^{2} (x) - 2 cos (x) - 1 = 0

3sin(x)=2tan(x)

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