> 数学 >
已知函数f(x)=2sin(π/4+x)sin(π/4-x),则f(π/3)的值等于
人气:378 ℃ 时间:2020-05-27 21:39:04
解答
已知函数f(x)=2sin(π/4+x)sin(π/4-x),
=2sin(π/4+x)cos(π/4+x),
=sin(π/2+2x)
=cos2x
f(π/3)=cos2π/3=-1/2
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版