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三角函数最值问题已知x,y,z为实数,求:f(x,y,z)=[sin(x-y)]^2+[sin(y-z)]^2+[sin
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求函数z=sinx+siny+sin(x+y)(0
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设二元函数z=sin(x-y),求αz/αy,αy/αz,dz