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The graph of

y=xsin⁡(x)

is sketched below.

Find the shaded area.


You should be able to use integration by parts to show that

∫xsin⁡(x)dx=sin⁡(x)−xcos⁡(x)

That means

∫abxsin⁡(x)dx=[sin⁡(x)−xcos⁡(x)]ab