How to Prove These Vector Integration Problems?

[zhaene]

(a) Prove that $$\begin{array}{clcr}\int\int_{S} r^{5}ndS=\int\int\int_{V}5r^{3}$$rdV

(b) Prove that $$\begin{array}{clcr}\oint_{c}\phi{d}$$r$$=\begin{array}{clcr}\int\int_{S}dS\times\nabla\phi$$

 

[noblegas]

(a) Prove that $$\begin{array}{clcr}\int\int_{S} r^{5}ndS=\int\int\int_{V}5r^{3}$$rdV

(b) Prove that $$\begin{array}{clcr}\oint_{c}\phi{d}$$r$$=\begin{array}{clcr}\int\int_{S}dS\times\nabla\phi$$

Did you actually work out this problem yet?