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受欢迎的三角函数 >

1.47=((sin((x+60)/2))/(sin(30)))

解答

1.47 = (\frac{sin ( \frac{x + 60}{2} )}{sin ( 3 0 ^{\circ} )})

解答

x = 2 \cdot 0.82566 \dots + 72 0^{\circ} n - 60, x = 36 0^{\circ} - 2 \cdot 0.82566 \dots + 72 0^{\circ} n - 60

+1

弧度

x = 2 \cdot 0.82566 \dots - 60 + 4 πn, x = 2 π - 2 \cdot 0.82566 \dots - 60 + 4 πn

求解步骤

1.47 = (\frac{sin ( \frac{x + 60}{2} )}{sin ( 3 0 ^{\circ} )})

交换两边

\frac{sin ( \frac{x + 60}{2} )}{sin ( 3 0 ^{\circ} )} = 1.47

sin (3 0^{\circ}) = \frac{1}{2}

sin (3 0^{\circ})

使用以下普通恒等式:

sin (3 0^{\circ}) = \frac{1}{2}

sin (3 0^{\circ})

sin (x)

周期表（周期为

36 0^{\circ} n

"）：

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= \frac{1}{2}

= \frac{1}{2}

\frac{sin ( \frac{x + 60}{2} )}{\frac{1}{2}} = 1.47

在两边乘以

\frac{1}{2}

\frac{sin ( \frac{x + 60}{2} )}{\frac{1}{2}} = 1.47

在两边乘以

\frac{1}{2}

\frac{sin ( \frac{x + 60}{2} ) \frac{1}{2}}{\frac{1}{2}} = 1.47 \cdot \frac{1}{2}

化简

\frac{sin ( \frac{x + 60}{2} ) \frac{1}{2}}{\frac{1}{2}} = 1.47 \cdot \frac{1}{2}

化简

\frac{sin ( \frac{x + 60}{2} ) \frac{1}{2}}{\frac{1}{2}} : sin (\frac{x + 60}{2})

\frac{sin ( \frac{x + 60}{2} ) \frac{1}{2}}{\frac{1}{2}}

使用分式法则:

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

= \frac{sin ( \frac{x + 60}{2} ) \frac{1}{2} \cdot 2}{1}

使用分式法则:

\frac{a}{1} = a

= sin (\frac{x + 60}{2}) \frac{1}{2} \cdot 2

分式相乘:

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

= \frac{1 \cdot 2}{2} sin (\frac{x + 60}{2})

约分:

2

= sin (\frac{x + 60}{2}) \cdot 1

乘以:

sin (\frac{x + 60}{2}) \cdot 1 = sin (\frac{x + 60}{2})

= sin (\frac{x + 60}{2})

化简

1.47 \cdot \frac{1}{2} : 0.735

1.47 \cdot \frac{1}{2}

分式相乘:

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

= \frac{1 \cdot 1.47}{2}

数字相乘:

1 \cdot 1.47 = 1.47

= \frac{1.47}{2}

数字相除:

\frac{1.47}{2} = 0.735

= 0.735

sin (\frac{x + 60}{2}) = 0.735

sin (\frac{x + 60}{2}) = 0.735

sin (\frac{x + 60}{2}) = 0.735

使用反三角函数性质

sin (\frac{x + 60}{2}) = 0.735

sin (\frac{x + 60}{2}) = 0.735

的通解

sin (x) = a \Rightarrow x = arcsin (a) + 36 0^{\circ} n, x = 18 0^{\circ} - arcsin (a) + 36 0^{\circ} n

\frac{x + 60}{2} = arcsin (0.735) + 36 0^{\circ} n, \frac{x + 60}{2} = 18 0^{\circ} - arcsin (0.735) + 36 0^{\circ} n

\frac{x + 60}{2} = arcsin (0.735) + 36 0^{\circ} n, \frac{x + 60}{2} = 18 0^{\circ} - arcsin (0.735) + 36 0^{\circ} n

解

\frac{x + 60}{2} = arcsin (0.735) + 36 0^{\circ} n : x = 2 arcsin (0.735) + 72 0^{\circ} n - 60

\frac{x + 60}{2} = arcsin (0.735) + 36 0^{\circ} n

在两边乘以

2

\frac{x + 60}{2} = arcsin (0.735) + 36 0^{\circ} n

在两边乘以

2

\frac{2 ( x + 60 )}{2} = 2 arcsin (0.735) + 2 \cdot 36 0^{\circ} n

化简

x + 60 = 2 arcsin (0.735) + 72 0^{\circ} n

x + 60 = 2 arcsin (0.735) + 72 0^{\circ} n

将

60

到右边

x + 60 = 2 arcsin (0.735) + 72 0^{\circ} n

两边减去

60

x + 60 - 60 = 2 arcsin (0.735) + 72 0^{\circ} n - 60

化简

x = 2 arcsin (0.735) + 72 0^{\circ} n - 60

x = 2 arcsin (0.735) + 72 0^{\circ} n - 60

解

\frac{x + 60}{2} = 18 0^{\circ} - arcsin (0.735) + 36 0^{\circ} n : x = 36 0^{\circ} - 2 arcsin (0.735) + 72 0^{\circ} n - 60

\frac{x + 60}{2} = 18 0^{\circ} - arcsin (0.735) + 36 0^{\circ} n

在两边乘以

2

\frac{x + 60}{2} = 18 0^{\circ} - arcsin (0.735) + 36 0^{\circ} n

在两边乘以

2

\frac{2 ( x + 60 )}{2} = 36 0^{\circ} - 2 arcsin (0.735) + 2 \cdot 36 0^{\circ} n

化简

x + 60 = 36 0^{\circ} - 2 arcsin (0.735) + 72 0^{\circ} n

x + 60 = 36 0^{\circ} - 2 arcsin (0.735) + 72 0^{\circ} n

将

60

到右边

x + 60 = 36 0^{\circ} - 2 arcsin (0.735) + 72 0^{\circ} n

两边减去

60

x + 60 - 60 = 36 0^{\circ} - 2 arcsin (0.735) + 72 0^{\circ} n - 60

化简

x = 36 0^{\circ} - 2 arcsin (0.735) + 72 0^{\circ} n - 60

x = 36 0^{\circ} - 2 arcsin (0.735) + 72 0^{\circ} n - 60

x = 2 arcsin (0.735) + 72 0^{\circ} n - 60, x = 36 0^{\circ} - 2 arcsin (0.735) + 72 0^{\circ} n - 60

以小数形式表示解

x = 2 \cdot 0.82566 \dots + 72 0^{\circ} n - 60, x = 36 0^{\circ} - 2 \cdot 0.82566 \dots + 72 0^{\circ} n - 60

作图

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