Recent content by JohnTheMan

Ahh. That makes sense. Thanks a lot.

I didn't square it, I took the second derivative.

Homework Statement z = ƒ(x,y), x = rcos(θ), y = rsin(θ) Use the chain rule to show that: \frac{1}{r^{2}}\frac{\partial ^{2} z}{\partial \theta ^{2}} = sin^{2}(\theta)\frac{\partial ^{2} z}{\partial x^{2}}-2sin(\theta)cos(\theta)\frac{\partial ^{2} z}{\partial x \partial...