[MNR 1982; Karnataka CET 1999]
A) $ \cos x+x\sin x $
B) $ x\sin x $
C) $ x\cos x $
D) None of these
Correct Answer: B
Since, $ f(x)=\int_0^{x}{t\sin tdt} $.Now, according to Leibnitz’s rule, $ {f}’(x)=x\sin x.(1)-0 $ .
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