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Bab limit trigonometri
.
lim(x->0) { 1 - cos² 2x } / { 1 - cos² 4x)
x = 0 --> bentuk 0/0
dgn faktorisasi.
1 - cos² 2x = sin² 2x
1- cos² 4x = sin² 4x
.
lim(x->0) (sin² 2x)/(sin² 4x)
= (2x)² / (4x)²
= 4/16
= 1/4