数学三角函数化简最大值问题
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s2x. n(2x-派)+sin(-派/2)=-1/2,-sin2x-1=-1/2,sin2x=-1/2, cos4x=1-2(sin2x)^2=1/2. nxsiny=(-1/2)[cos(x+y)-cos(x-y)]<=(-1/2)[-1-(根号2)/2]=[2+(根号2)]/4
答:①先计算sin(60°-θ)*sin(60°+θ) =(sin60°cosθ-cos60°sinθ)*(sin60°cosθ+cos60°sinθ) =sin&...详情>>
答:详情>>