Use the Chain Rule to find the indicated partial derivatives. w = xy + yz + zx,    x = r cos(θ),    y = r sin(θ),    z = rθ;   ∂w ∂r ,  ∂w ∂θ     when r = 4, θ =  π 2

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter9: Multivariable Calculus
Section9.2: Partial Derivatives
Problem 36E
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Use the Chain Rule to find the indicated partial derivatives.

w = xy + yz + zx,    x = r cos(θ),    y = r sin(θ),    z = rθ;
 
∂w
∂r
∂w
∂θ
    when r = 4, θ = 
π
2
 
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ISBN:
9780321964038
Author:
GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:
Pearson Addison Wesley,