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turunan pertama
4 sin³ 3x . cos 3x. 3
= 12 sin³ 3x. cos 3x
= 12 sin² 3x . sin 3x . cos 3x
= 6 sin² 3x . sin 6x
nomer 1:
turunan pertama
-3x²-16x
f-1 (-2) = -3(4) - 16(-2)
= -12 + 32
= 20