1.

Derivative of (-x sinx + cosx).

Answer»

y = -x sinx + cosx

\(\frac {dy}{dx}\) = -x cosx - sinx - sinx

\(\frac {dy}{dx}\) = - x cosx - 2sinx

\(\frac {d^2y}{dx^2}\) = - cosx + x sinx - 2cosx



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