Extra Examples of Trigonometric Integrals

2. Z sin5 x dx = Z sin4 x sinx dx isolate one copy of sinx Z sin2 x 2 sinx dx nd remaining even powers of sinx = Z 1 cos 2x 2 sinx dx convert sin x using trig. identity u = cosx du = sinx dx du = sinx dx don’t need to expand algebra yet ... ................
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