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1-Find partial derivative of zx for zcosz=x2y3+z 2- Find tangent plane eq. to the surface zx2+xy2+yz2=5...

1-Find partial derivative of zx for zcosz=x2y3+z

2- Find tangent plane eq. to the surface zx2+xy2+yz2=5 at the point (-1,1,2)

3- Find all critical points of f(x,y)=xy2-x2y2+x4+3.

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