> 数学 >
cos(-19/6π)=?
人气:266 ℃ 时间:2020-07-16 10:44:35
解答
cos(-19/6π)
=cos (-3π-1/6π)
=cos(-π-1/6π)
=cos(π+1/6π)
=-cos(1/6π)
=-√3/2
推荐
猜你喜欢
© 2025 79432.Com All Rights Reserved.
电脑版|手机版