Find the limit, if it exists, or type N if it does not exist.
(Hint: use polar coordinates.)

lim (x,y)--(0,0)          (7x^3+8y^3)/(x^2+y^2)     

I know that x^2+y^2=r^2 but can't seem to compute the numerator. A solution and explanation would be wonderful. 

Answer rating: 100% (QA)

7x 8y 2 xy00 x y Consider lim Using polar coordinates we have xr... View the full answer