> 其他 >
sinπ/12-根号3cosπ/12的值
人气:449 ℃ 时间:2020-03-27 12:33:04
解答
原式=2(sinπ/12*1/2-cosπ/12*√3/2)
=2(sinπ/2cosπ/3-cosπ/12sinπ/3)
=2sin(π/12-π/3)
=2sin(-π/4)
=-√2
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版