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受欢迎的三角函数 >

sin(arcsin(1/4)+arctan(-4))

解答

sin (arcsin (\frac{1}{4}) + arctan (- 4))

解答

\frac{17}{68} - \frac{255}{17}

+1

十进制

- 0.87870 \dots

求解步骤

sin (arcsin (\frac{1}{4}) + arctan (- 4))

利用以下特性:

arctan (- x) = - arctan (x)

arctan (- 4) = - arctan (4)

= sin (arcsin (\frac{1}{4}) - arctan (4))

使用三角恒等式改写:

sin (arcsin (\frac{1}{4})) cos (arctan (4)) - cos (arcsin (\frac{1}{4})) sin (arctan (4))

sin (arcsin (\frac{1}{4}) - arctan (4))

使用角差恒等式:

sin (s - t) = sin (s) cos (t) - cos (s) sin (t)

= sin (arcsin (\frac{1}{4})) cos (arctan (4)) - cos (arcsin (\frac{1}{4})) sin (arctan (4))

= sin (arcsin (\frac{1}{4})) cos (arctan (4)) - cos (arcsin (\frac{1}{4})) sin (arctan (4))

使用三角恒等式改写:

sin (arcsin (\frac{1}{4})) = \frac{1}{4}

利用以下特性:

sin (arcsin (x)) = x

= \frac{1}{4}

使用三角恒等式改写:

cos (arctan (4)) = \frac{17}{17}

cos (arctan (4))

使用三角恒等式改写:

cos (arctan (4)) = \frac{1 + 4 ^{2}}{1 + 4 ^{2}}

利用以下特性:

cos (arctan (x)) = \frac{1 + x ^{2}}{1 + x ^{2}}

= \frac{1 + 4 ^{2}}{1 + 4 ^{2}}

= \frac{1 + 4 ^{2}}{1 + 4 ^{2}}

化简

= \frac{17}{17}

使用三角恒等式改写:

cos (arcsin (\frac{1}{4})) = \frac{15}{4}

cos (arcsin (\frac{1}{4}))

使用三角恒等式改写:

cos (arcsin (\frac{1}{4})) = 1 - (\frac{1}{4})^{2}

利用以下特性:

cos (arcsin (x)) = 1 - x^{2}

= 1 - (\frac{1}{4})^{2}

= 1 - (\frac{1}{4})^{2}

化简

= \frac{15}{4}

使用三角恒等式改写:

sin (arctan (4)) = \frac{4 17}{17}

sin (arctan (4))

使用三角恒等式改写:

sin (arctan (4)) = \frac{4 1 + 4 ^{2}}{1 + 4 ^{2}}

利用以下特性:

sin (arctan (x)) = \frac{x 1 + x ^{2}}{1 + x ^{2}}

= \frac{4 1 + 4 ^{2}}{1 + 4 ^{2}}

= \frac{4 1 + 4 ^{2}}{1 + 4 ^{2}}

化简

= \frac{4 17}{17}

= \frac{1}{4} \cdot \frac{17}{17} - \frac{15}{4} \cdot \frac{4 17}{17}

化简

\frac{1}{4} \cdot \frac{17}{17} - \frac{15}{4} \cdot \frac{4 17}{17} : \frac{17}{68} - \frac{255}{17}

\frac{1}{4} \cdot \frac{17}{17} - \frac{15}{4} \cdot \frac{4 17}{17}

\frac{1}{4} \cdot \frac{17}{17} = \frac{17}{68}

\frac{1}{4} \cdot \frac{17}{17}

分式相乘:

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

= \frac{1 \cdot 17}{4 \cdot 17}

乘以:

1 \cdot 17 = 17

= \frac{17}{4 \cdot 17}

数字相乘:

4 \cdot 17 = 68

= \frac{17}{68}

\frac{15}{4} \cdot \frac{4 17}{17} = \frac{255}{17}

\frac{15}{4} \cdot \frac{4 17}{17}

分式相乘:

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

= \frac{15 \cdot 4 17}{4 \cdot 17}

约分:

4

= \frac{15 17}{17}

化简

1517 : 255

1517

使用根式运算法则:

a b = a \cdot b

1517 = 15 \cdot 17

= 15 \cdot 17

数字相乘:

15 \cdot 17 = 255

= 255

= \frac{255}{17}

= \frac{17}{68} - \frac{255}{17}

= \frac{17}{68} - \frac{255}{17}

流行的例子

sin (\frac{4}{7})

3 sin (21 0^{\circ})

16 cos (3 0^{\circ})

arcsin(cos(-(5pi)/4))

arcsin (cos (- \frac{5 π}{4}))

- sec (\frac{π}{4})