y=cos(π/4+x)cos(π/4-x)的单调递减区间
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y=cos(π/4+x)cos(π/4-x)的单调递减区间y=cos(π/4+x)cos(π/4-x)的单调递减区间y=cos(π/4+x)cos(π/4-x)的单调递减区间y=cos(π/4+x)c
y=cos(π/4+x)cos(π/4-x)的单调递减区间
y=cos(π/4+x)cos(π/4-x)的单调递减区间
y=cos(π/4+x)cos(π/4-x)的单调递减区间
y=cos(π/4+x)cos(π/4-x)的单调递减区间
y=cos(π/4+x)cos(π/4-x)=(1/2)[cos2x+cos(π/2)]=(1/2)cos2x
由2kπ≦2x≦2kπ+π,得单减区间为 kπ≦x≦kπ+π/2,k∈Z.
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