sin12分之5派等于多少cos12分之5派得多少.
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 06:11:05
![sin12分之5派等于多少cos12分之5派得多少.](/uploads/image/z/968187-3-7.jpg?t=sin12%E5%88%86%E4%B9%8B5%E6%B4%BE%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91cos12%E5%88%86%E4%B9%8B5%E6%B4%BE%E5%BE%97%E5%A4%9A%E5%B0%91.)
sin12分之5派等于多少cos12分之5派得多少.
sin12分之5派等于多少cos12分之5派得多少.
sin12分之5派等于多少cos12分之5派得多少.
sin 5/12π
=sin(1/6π +1/4π)
=sin(1/6π)cos(1/4π) + cos(1/6π)sin(1/4π)
=√2/2*1/2 + √2/2*√3/2
=(√2+√6)/4
cos 5/12π
=cos(1/6π +1/4π)
=cos(1/6π)cos(1/4π) — sin(1/6π)sin(1/4π)
=√3/2*√2/2 — 1/2 *√2/2
=(√6 — √2)/4
0·022844319 0·999739034