用二倍角公式,化简成sin(2x)和cos(2x),然后合并,再求导,求出单调增或减区间.取倒数零点,找到极值,然后找到最大值
已知函数f(x)=sin^2x+根号3sinxsin(x+π/2)-a,(a∈R,a为常数)
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