how do you integrate (x-t)sintdt from o to x? Thanks Do you use substitution?
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$\displaystyle \int_{0}^{x}{(x-t)\sin (t)\,dt}=x\int_{0}^{x}{\sin (t)\,dt}-\int_{0}^{x}{t\sin (t)\,dt}.$ First one is immediate and the second one requires integration by parts.
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