sin x - x cosx
sinx + x cosx
sinx - cosx
sinx + cosx
Correct answer is B
If y = x sinx, then
Let u = x and v = sinx
dudx = 1 and dvdx = cosx
Hence by the product rule,
dydx = v dudx + udvdx
= (sin x) x 1 + x cosx
= sinx + x cosx
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