## anonymous 5 years ago integrate Cos5xCos3x

1. anonymous

ans = 0.5(sin8x/8+sin2x/2)

2. anonymous

+ c

3. anonymous

using integration by parts i got something a little different $\int\limits_{}^{} \cos 5x \cos 3x = -\frac{3}{16}\sin 3x \cos 5x + \frac{5}{16}\sin 5x \cos 3x +C$