[2] a) lim sin(10x) x - 0 4x = [2] b) lim- tan x - x -+0 9x 2. Differentiate each of the following and simplify fully. (Factor, add fractions, etc.) (Hint: you may need to use trigonometric identities!) [2] a) y = sin(14x15) [2] b) y = cot(11x2 - 17x) [3] c) y = 18x6 sec(5x7) [3] d) y = secx sin x