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Use the Chain Rule to find ∂z/∂s and ∂z/∂t. 3. z=x/y, x=se^t, y=1+se^-t 4. z=e^rcos θ,...

Use the Chain Rule to find ∂z/∂s and ∂z/∂t.
3. z=x/y, x=se^t, y=1+se^-t
4. z=e^rcos θ, r=st, θ=√s^2+t^2
Math   Calculus   
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