M481 Lecture 1: LaPlace's Equation in Polar Coordinates: end of derivation

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My dog is looking at me you are funny man. Thank you for the video it helps

محمدالشهري-ظك
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I never understood why in the second derivative you aren't multiplying both parts by cos theta and it all expands what am I missing?

manuelodabashian
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i think maybe u missed a cos(theta) in the coefficient of d^2u/(dr)^2
edit: oh you fixed it

muhandez
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if x=r*cos(theta), then dx/dr=cos(theta), and not what you think and write

Garfield