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If z = f(x, y) and x = 3r cos 2θ , y = 2r sin 3θ ,express ∂z∂r in terms of ∂z∂x and ∂z∂y . Does not copy paste correctly, look at the picture for the question.

If z = f(x, y) and x = 3r cos 2θ , y = 2r sin 3θ ,express ∂z∂r in terms of ∂z∂x and ∂z∂y

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Does not copy paste correctly, look at the picture for the question. 

 
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