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## Homework Statement

intergral from pi to 0.

of

(sin(3t)dt)^4

## The Attempt at a Solution

okay so i know how to do this but when i tried substitution putting 3t=u and (1/3)du= dt i always came with the the wrong coefficient at the end with the answer and so i would multiply it wrong. but then when i do not use u/du substitution everything works well? why is that? what is the difference? and im using u/du substitution improperly or something?