Postingan
(f(x)=cos x maka f’(x)=-sin x)
f(x) =cos x
f(x+h) =cos(x+h)
cos A – cos B = -2sin (A+B/2).sin (A-B/2)
f’(x) = lim
h 0
=
lim
h→0
=lim
h
0
=lim
H
0
= lim sin (2x+h) / 2 - 2 (sin h/2) / 2
h→0
=lim
H 0
f’(x) = sin x . -1
f’(x)=
-sin x
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