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Homework Statement
Evaluate the indefinite integral of x*cos(3x)^2
Homework Equations
Integration by parts: [itex]\int(udv)[/itex]= uv - [itex]\int(vdu)[/itex]
The Attempt at a Solution
Im having trouble finding the antiderivative of cos(3x)^2 (which I designated as dv when doing integration by parts). I keep getting (1/9)(sin(3x)^3) using the power and chain rules, but that's not correct.
Thanks!