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Que.1[A] answer the following multiple choice questions.(K/W) (7 marks) 1. The 15th derivative of y = cosx is a. Sinx b. Cosx C. -COSX d. -sinx 2. Which vector is not collinear with a = [6 , -4] ? a. b = [3,-2] b. = -6,-4 . d= -6,4 d. e=[-9,6] 3. Which point is not a solution to the equation 3x -4y +z -12 =0 ? a. (-8,-9,0) b. (4,1,4) c. (16,10,4) d. (18,12,2) 4. If f(x) = sin3x + cos2x , then a. f(x) = cos3x - sin2x b. f(x) = 3sinx + 2cosx c. f(x) = 3cos3x - 2sin2x d. f(x) = 5cos5x 5. if u = [3,-4] and v = [6,k] , and u is orthogonal to v, then the value of k is a. -8 b. 4.5 C. 8 d. -4.5 6. Given A(1,3,-7) and B(0,2,-4) , the exact magnitude of AB is V147 b. 3 C. V11 d. 3.3 7. Which of the following is a derivative of y = 5* ? a. dy dx = 5% In 5 dy D. = e dx dy C. = 5ex dx dy = 5(5*)