> 数学 >
已知函数f(x)满足f(sinx)=cos2x,则f(cosπ/4)=
人气:425 ℃ 时间:2020-02-03 10:08:21
解答
设sinx=t
cos2x=1-2t^2
f(x)=1-2x^2
f(cosπ/4)= 1-2*(cosπ/4)^2
=1-2*(1/2)
=0
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版