Double Integral (Change to Polar Coordinate)

Double integral, with change of coordinates to polar. Integral over a ring, by Dr. P. https://youtu.be/YoppUy7TaA4 Gaussian Integral T-shirt: https://teespring.com/GaussianIntegral For more resource, please visit: https://www.blackpenredpen.com/calc2 Click to subscribe for more math contents: https://www.youtube.com/blackpenredpen?sub_confirmation=1 Check out my T-shirts & Hoodies: https://teespring.com/stores/blackpenredpen support bprp on Patreon (there's a discount code to bprp Teespring store for everyone) https://www.patreon.com/blackpenredpen I create my site www.blackpenred.com on Wix, give it a try: http://wixstats.com/?a=25754&c=124&s1= Check out my site & social media 😃 https://blackpenredpen.com 😃 https://twitter.com/blackpenredpen 😃 https://www.instagram.com/blackpenredpen/ Thank you for your support! blackpenredpen | 曹老師