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受欢迎的三角函数 >

sin((5pi)/(12))+sin(pi/(12))

解答

sin (\frac{5 π}{12}) + sin (\frac{π}{12})

解答

\frac{3}{2}

+1

十进制

1.22474 \dots

求解步骤

sin (\frac{5 π}{12}) + sin (\frac{π}{12})

使用三角恒等式改写:

2 sin (\frac{π}{4}) cos (\frac{π}{6})

sin (\frac{5 π}{12}) + sin (\frac{π}{12})

使用和差化积恒等式:

sin (s) + sin (t) = 2 sin (\frac{s + t}{2}) cos (\frac{s - t}{2})

= 2 sin (\frac{\frac{5 π}{12} + \frac{π}{12}}{2}) cos (\frac{\frac{5 π}{12} - \frac{π}{12}}{2})

化简:

\frac{\frac{5 π}{12} + \frac{π}{12}}{2} = \frac{π}{4}

\frac{\frac{5 π}{12} + \frac{π}{12}}{2}

合并分式

\frac{5 π}{12} + \frac{π}{12} : \frac{π}{2}

使用法则

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

= \frac{5 π + π}{12}

同类项相加:

5 π + π = 6 π

= \frac{6 π}{12}

约分:

6

= \frac{π}{2}

= \frac{\frac{π}{2}}{2}

使用分式法则:

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

= \frac{π}{2 \cdot 2}

数字相乘:

2 \cdot 2 = 4

= \frac{π}{4}

化简:

\frac{\frac{5 π}{12} - \frac{π}{12}}{2} = \frac{π}{6}

\frac{\frac{5 π}{12} - \frac{π}{12}}{2}

合并分式

\frac{5 π}{12} - \frac{π}{12} : \frac{π}{3}

使用法则

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

= \frac{5 π - π}{12}

同类项相加:

5 π - π = 4 π

= \frac{4 π}{12}

约分:

4

= \frac{π}{3}

= \frac{\frac{π}{3}}{2}

使用分式法则:

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

= \frac{π}{3 \cdot 2}

数字相乘:

3 \cdot 2 = 6

= \frac{π}{6}

= 2 sin (\frac{π}{4}) cos (\frac{π}{6})

= 2 sin (\frac{π}{4}) cos (\frac{π}{6})

使用以下普通恒等式:

sin (\frac{π}{4}) = \frac{2}{2}

sin (\frac{π}{4})

sin (x)

周期表（周期为

2 πn

"）：

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= \frac{2}{2}

使用以下普通恒等式:

cos (\frac{π}{6}) = \frac{3}{2}

cos (\frac{π}{6})

cos (x)

周期表（周期为

2 πn

）：

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= \frac{3}{2}

= 2 \cdot \frac{2}{2} \cdot \frac{3}{2}

化简

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

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

分式相乘:

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

= \frac{2 3 \cdot 2}{2 \cdot 2}

约分:

2

= \frac{2 3}{2}

使用根式运算法则:

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

= \frac{2 ^{\frac{1}{2}} 3}{2}

使用指数法则:

\frac{x ^{a}}{x ^{b}} = \frac{1}{x ^{b - a}}

\frac{2 ^{\frac{1}{2}}}{2 ^{1}} = \frac{1}{2 ^{1 - \frac{1}{2}}}

= \frac{3}{2 ^{1 - \frac{1}{2}}}

数字相减:

1 - \frac{1}{2} = \frac{1}{2}

= \frac{3}{2 ^{\frac{1}{2}}}

使用根式运算法则:

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

= \frac{3}{2}

合并相同指数项 :

\frac{x}{y} = \frac{x}{y}

= \frac{3}{2}

= \frac{3}{2}

流行的例子

ln(sec(pi/4)+tan(pi/4))

(5.5)/(cos(61))

cos((5pi)/(12))+cos(pi/(12))