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u = 2x³ - 3x
u ' = 6x² - 3
y = sin³ (2x³ - 3x) = sin³ u
y ' = 3 sin² u . cos u . u' = 3 sin² (2x³ - 3x) . cos (2x³ - 3x) . (6x² - 3)
= (18x² - 9) sin² (2x³ - 3x) . cos (2x³ - 3x)
y ' = 3(sin² (2x³ - 3x)) (cos (2x³ - 3x)) (6x² - 3)
= (18x² - 9) sin² (2x³ - 3x) cos (2x³ - 3x)