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misal
u(x) = x² maka u'(x) = 2x
v(x) = sin 3x maka v'(x) = 3 cos 3x
y(x) = u(x) · v(x)
dy/dx = y'(x)= u'(x)·v(x) - u(x)·v(x)
= 2x sin 3x - x² · 3cos 3
= 2x sin 3x - 3x² cos 3x