Integrating (cos x) ^ 4 - Even Powers of Cosine and Sine

Thanks to all of you who support me on Patreon. You da real mvps!   $1 per month helps!! :)  Patreon: patrickjmt !! Integrating  (cos x) ^ 4  - Even Powers of Cosine and Sine.  In this video, I show how to integrate (cosx)^4 using some an identity, some algebra, and a u-sub.

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