lim = cos 2x - 1 x-0 ---------------- =.............. Xpangkat2 tolongg d jwab ya........

Lim (cos 2x - 1)/(x^2)
x=>0

Lim (-2 sin^2 x) / (x^2)
x=>0

Lim -2 . (sin x)/x . (sin x)/x
x=>0

= -2 . 1 . 1

= -2