Jika f(x) = sinx / 1+cosx maka f'(x) =....

U = sin x
U' = cos x
v = 1 + cos x
v' = -sin x

f'(x) = (VU' - UV') / V^2
=(1+cos x)(cos x) - (sin x)(-sin x) /(1+cos x)^2
= cos x + cos^2 x + sin^2 x / (1+cos)^2
= cos x + 1 / (1+ cos)^2
= 1/ 1+cos

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