13. Hitunglah lim (1 – sin^2(x))/x saat x mendekati 0.
Jawaban: lim (1 – sin^2(x))/x = 1
14. Hitunglah lim (sin(x/2)/x saat x mendekati 0.
Jawaban: lim (sin(x/2)/x = 1/2
15. Hitunglah lim (cos(x/2)/x saat x mendekati 0.
Jawaban: lim (cos(x/2)/x = -1/2