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x = angka
U = ekspresi matematika yang mengandung variabel
** phi = 180 derajat
** sin (x + 180) = - sin x
Jadi, sin (3x + phi) = sin (3x + 180) = - sin 3x
** 1/ sin x = csc x
Jadi, 3/ (- sin 3x) = - 3 csc 3x
** Dicari: turunan - 3 csc 3x
** y = csc x --> y' = - csc x . cot x
** y = csc U --> y' = - csc U . cot U . U'
Soal:
y = - 3 csc 3x
U = 3x
U' (turunan U) = 3
y' = - 3 (- csc 3x . cot 3x . 3)
y' = 9 csc 3x . cot 3x
y' = 9 cot 3x . csc 3x
(A)