Hi

Let

The derivative of is

The quotient rule is used to calculate u'(x)

1+\cos x) - (- \sin x)\1-\sin x)}{(1+\cos x)^2} = \frac{-1 -\cos x + \sin x}{(1+\cos x)^2}" alt="u'(x) = \frac{-\cos x\1+\cos x) - (- \sin x)\1-\sin x)}{(1+\cos x)^2} = \frac{-1 -\cos x + \sin x}{(1+\cos x)^2}" />

The derivative of is therefore