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if z = f(x,y) and x=rcos(2(theta) ) y= 2rsin(theta) express dz/d(theta) in terms of dz/dx and dz/dy

if z = f(x,y)

and x=rcos(2(theta) ) y= 2rsin(theta)

express dz/d(theta)

in terms of dz/dx and dz/dy

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