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cos 5x bernilai 1 maka:
lim (sin 3x - 1)/(sin 3x - sin 5x)
x->0
pakai turunan:
lim (3 cos 3x)/(3 cos 3x - 5 cos 5x)
x->0
masukan nilai limit x = 0
(3 cos 0)/(3 cos 0 - 5 cos 0)
= 3/(3 - 5)
= - 3/2