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Verified answer
Turunany = sin² (3x - 7)
y' = dsin² (3x - 7)/dsin (3x - 7) . dsin (3x - 7)/d(3x - 7) . d(3x - 7)/dx
y' = 2 sin (3x - 7) . cos (3x - 7) . 3
y' = 3 sin 2(3x - 7)
y' = 3 sin (6x - 14)