Find an equation of the tangent plane to the parametric surface r=(u,v)=ucosv I +usinv j +vk at u=1, v=pi/3
Find the surface area of the parametric surface r(u,v)=5sinucosv I + 5sinusinv j+ 5cosu k, for 0 ,<= u <=pi and o<=v<= 2pi
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