若z=x+iy,试证明|sin²z|=sin²x+sh²y
证明sinx+siny+sinz-sin(x+y+z)=4sin((x+y)/2)sin((x+y)/2)sin((x+
三角不等式证明证明sin(x+y)+sin(y+z)+sin(z+x)>sinx+siny+sinz+sin(x+y+z
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若(z-x)²-4(x-y)(y-z)=0,试证明:x+z=2y 已学至15.2乘法公式
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x+y+z+sin(x+2y+3z)=0,求Zx偏导.
求函数z=sinx+siny+sin(x+y)(0
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若x-y=6,xy=-8,求代数式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值