1.

y = sin x + cos x, find its derivative.

Answer»

y = sin x + cos x

The derivative of y is \(\frac{dy}{d\mathrm x}\) = \(\frac{d}{d\mathrm x}\)(sin x + cos x)

\(=\frac{d}{d\mathrm x}\)sin x + \(\frac{d}{d\mathrm x}\)cos x

= cos x – sin x



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