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kalau tdk salah.
y = (2x - 1)^9
y ' = 9.2(2x - 1)^8
= 18(2x - 1)^8
B================
y = 6sin x + 2 cos x
y' = 6 cos x - 2 sin x
C==============
y = cos (3x - 2)
y' = -3sin (3x -2)
D=========
y =x² cos x
y ' = 2x cos x - x² sin x