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Question
Find the derivative of x2 cosx.
Solution
Let y = x2 cosx
Differentiating both sides with respect to x, we
`(dy)/(dx) = d/(dx)(x^2 cos x)`
= `x^2 d/(dx) (cos x) + cos x d/(dx) (x^2)`
= `x^2(- sinx) + cosx (2x)`
= `2x cosx - x^2 sinx`
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