I've been able to do all of them up until these two:(adsbygoogle = window.adsbygoogle || []).push({});

1) [tex] \int x\cos^{2}x dx [/tex]

and

2) [tex] \int [/tex] from [tex]-\pi[/tex] to [tex]\pi[/tex] of [tex] \sin^{137}x dx [/tex]

I've been using half angle formulas where (cos x)^2 = (1/2)(1 + cos 2x) and (sin x)^2 = (1/2)(1 - cos 2x)

I just can't figure those two out. Any help would be highly appreciated

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# Trigonometric Integrals

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