f(x)=cosx-cos(x+π⼀2)的最大值怎么求············

f(x)属于R...
2026年09月19日 01:38
有1个网友回答
网友(1):

f(x)=cosx-cos(x+π/2)
=-2(sin(x+x+π/2)/2sin(x-x-π/2)/2
=-2(sin(x+π/4)sin(-π/4)
=√2sin(x+π/4)
所以最大值是√2