tolong bantuannya kk

u = sin x v = sin x - cos x
u' = cos x v' = cos x + sin x

F(x)' = u' v - v' u / v^2
=cos x(sin x - cos x) - (cosx + sin x)sinx
=sinxcosx - cos^2 x- sinxcosx - sin^2 x
Ada yang sama jadi bisa dicoret. Jadi tinggal
= - sin^2 x - cos^2 x
= -1

(Sin^2 x + cos^2 x = 1
-sin^2 x - cos^2 x = -1 ... dikalikan -1 kedua ruasnya )