1. If f is integrable on [-1l',1l'J and a E R, prove that lim 111' f(x)sin(k+a)xdx=O. k-+oo...

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1. If f is integrable on [-1l',1l'J and a E R, prove that lim 111' f(x)sin(k+a)xdx=O.

k-+oo -11'

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