Integral of 3 cos (5x)?

i don't know how to do this because of 5x... because if it were differentiation, chain rule would apply.. but for integration, what do you do?
i tried the problem based on something off the internet and got for my final answer, (3/5) sin 5x. Is this right?

Question

Integral of 3 cos (5x)?

i don't know how to do this because of 5x... because if it were differentiation, chain rule would apply.. but for integration, what do you do?
i tried the problem based on something off the internet and got for my final answer, (3/5) sin 5x. Is this right?

ganeshie8 · Answer

two ways to do this :
1) advanced guessing
2) substitution

ganeshie8 · Answer

pick one..

anonymous · Answer

Oh I see, this lesson is on u-susbstitution, so I should use that. Thanks!

ganeshie8 · Answer

good, u knw how to take the integral now ha :)

simply sub
u = 5x

anonymous · Answer

Yep. Working on it right now :) Thanks! I'll close the question now.

ganeshie8 · Answer

cool :)