21 Which of the following if the derivative of z* sin (3x) ? Select one alternative: O 12r cos(3:) O 4x sin(3x) + 3x cos(3x) 0 4x3 sin(3x) - 3x3 cos(3x) O 4r sin(3x) 22 Which of the following is the derivative of x(e # + In(2x)), where = > 0 ? Select one alternative: Oe" + In(2x) - z(e- -!) Of " + In(2z) +z ( e-+=) Oe " + In(2x) - ze + O-e"+ 23 Which of the following is an equivalent expression of 4 log; 2 + log; b - 2 log; 64 = a? Select one alternative: 0 3" = 3 0 3" = 4b 1 -b 32 O 3" = 2b 24 Which of the following is the only solution to the equation log(x-1) 9 = 2? Select one alternative: On = 10 Of = 7 Or =4 Of = -2