sin x.cosx turunan ny adalh

misal
u = sinx --> u'=cosx
v = cosx --> v'=-sinx

jadi,
turunan sinxcosx
=> u'v+uv'
=> (cosx)(cosx)+(sinx)(-sinx)
=> cos^2x-sin^2x
=> cos2x

Semoga bermanfaat, tetap semangat
Salam, JKira

y = sin x . cos x
y = 1/2 sin 2x

y' = 1/2 . dsin 2x /2x × d2x/dx
y' = 1/2 . cos 2x . 2
y' = cos 2x