Use the Chain Rule to find the indicated partial derivatives. u=x 3
+yz,x=prcos(θ),y=prsin(θ),z=p+r ∂p
∂u
​
, ∂r
∂u
​
, ∂θ
∂u
​
when p=1,r=1,θ=0 ∂p
∂u
​
=
∂r
∂u
​
=
∂θ
∂u
​
=
​