Section 13.2, Problem 24:

Computer the limit lim_{(x,y)->(0,0)} y*ln(x^2+y^2), by converting to pollar coordinates.

We get: r^2=x^2+y^2 and r->0, and y=r*sin(theta), but theta does not go to 0.

There is a difference between r and theta. The one goes to 0, but the other one doesn’t.

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