Question 9 If tanxy = > then * = Not yet answered Marked out of 1.00 Flag question Select one: O a. 1-ytan(cry) sec(ry) stan (cy )sec(cy) O b. sec- (xy)-y O c. cos'(xcy) O d. cos'(ry) O e. cos' (ry)-y Question 10 Let y = a find the value of dy at x = 3 Not yet answered Marked out of 1.00 Flag question Select one: O a. dy 1093 9 O b. dy = 27 O c. dy = 27ln3 + 27 O d. dy = In9 + In3+ 1