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Question
x2 sin x + cos 2x
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Solution
`d/(dx) (x^2 sin x + cos 2x) = d/(dx) (x^2 sin x) + d/(dx) (cos 2x)`
= `(x^2 cos x + sin x * 2x) + (-2 sin 2x)`
= `x^2 cos x + 2x sin x - 2 sin 2x`
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