## ammu123 2 years ago integrate 6cos^3(3x)

1. hartnn

hello :) have you attempted this integral ?

2. hartnn

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

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