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y=sin^2*1/x求y"
设X属于(0,90度),求y=[2sin^2(X)+1]/[sin(2X)]的最小值
三角函数难题!设x∈[0,pi] ,y∈[0,1],试求函数f(x,y)=(2y-1)sin(x)+(1-y)sin((
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设方程e^(x+y) + sin(xy) = 1 确定的隐函数为y=y(x),求y'和y'|x=0
Z=x*sin xy+e^x+y或设y=(x)是由方程xy+sin x+sin y=1确定,求y”
Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y)