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f ' (x) = 3 (sin² (5 - 4x)) (cos (5 - 4x)) (-4)
= -12 sin² (5 - 4x) cos (5 - 4x)
f'(x) = 3 . sin²(5-4x) . cos (5-4x) . -4
f'(x) = -6 . sin (5-4x) . sin(10-8x)
:)