## ammu123 Group Title integrate 6cos^3(3x) one year ago one year ago

1. hartnn Group Title

hello :) have you attempted this integral ?

2. hartnn Group Title

there are several ways to solve this integral, one of the ways include, writing $$\cos^3 3x$$ as $$\cos^2 x \times \cos x$$ and do a 'u' substitution u= sin x

3. hartnn Group Title

will you try this method ? if you get stuck, ask me, i'll help you out :)