How to evaluate a double integral by using polar coordinates

We will integrate a double integral cos(x^2+y^2) dydx by using polar coordinates.
Here's the video on why dydx=rdθ https://youtu.be/r-38iiWg1vo?si=1MlhyApOLslQBI3A

How to evaluate double integrals (& how to change the order of integration) 10 examples, calculus 3
https://youtu.be/H-defN4ZNSo
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