I need help with this question, I am not too sure how I would go about it...

lim

(x,y)->(2+p2,2)

of

(y − 2)(x − (2 + p2))/

x2 − 4x − y2 + 3y

by writing f(x, y) = (2 + p2 + r cos(theta), 2 + r sin(theta)). Along which radial lines

does the limit equal to zero?