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

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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 :)

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