Question
$\frac{d}{{dx}}\left( {{x^2}\sin \frac{1}{x}} \right) = $
$ = - \frac{1}{{{x^2}}}.{x^2}\cos \left( {\frac{1}{x}} \right) + 2x\sin \left( {\frac{1}{x}} \right) = 2x\sin \left( {\frac{1}{x}} \right) - \cos \left( {\frac{1}{x}} \right)$.
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