f(x)=sin(x-π/4)+cos(x+π/4)的单调递增区间
4个回答
f(x)=sin(x-π/4)+sin[π/2-(x+π/4)]
=sin(x-π/4)+sin(π/4-x)
=sin(x-π/4)-sin(x-π/4)
=0
所以是常函数
所以没有增区间
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