Question 13 Find the derivative of f (x) = ln(3x) ln (5x) O f'(x) In(3x)+ln(5x) O f'(x) In(3x)+ln(5x) 5x 3 In (3x)+5 ln(5x) O f'(x) E O f'(x) 3 In (3x)+5 ln(5x) За O f'(x)= 5 In (3x)+3 ln(5x) = x 5