why dy dx = r dr dθ

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That is the determinant of the *Jacobean*, used whenever a change of variables is applied

asparkdeity
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I also need a tutorial for this video. Is this from calculus 3 or something else?

wjrasmussen
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lovely, you can write with a pen on the board, but I guess you really impress me, if you can explain a) what is "dx" and what is the operation "dxdy".
For the time being, I assume, you do not have a clue at all. =))

horstmueller
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ALMOST CORRECT. Dude your gonna wanna carry the 3 and THEN borrow Ycasa to get the answer R2d2. Duh 🤓

joelhoye