In this video I go over the derivation for the trigonometric identity cos(3x) = 4cos3(x) - 3cos(x). The proof is very similar to the derivation in my last video on the identity sin(3x). The derivation involves using the summation identity cos(x+y) multiple times, as well as the sine sum identity and the Pythagorean identity. This is a great video to see how derivations, especially trig identities, are setup and derived, which also helps to develop general logic which can be applied to all aspects of life. So make sure to watch this video!
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