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y = x² sin 3x
y' = 2x. sin 3x + x² (3 cos 3x)
y' = 2x sin 3x + 3x² cos 3x
2) D
y = sin 2x / x
y ' = 2 cos 2x (x) - sin 2x (1) / (x²)
y ' = (2x. cos 2x - sin 2x )/ (x²)
3) E
y = 2 cos² 2x = cos 4x - 1
y' = - 4 sin 4x