(98) Z csc 2 ax dx = - 1 a cot ax (99) Z csc 3 x dx = - 1 2 cot x csc x + 1 2 ln | csc x - cot x| (100) Z csc n x cot x dx = - 1 n csc n x, n 6=0 (101) Z sec x csc x dx = ln | tan x| Products of Trigonometric Functions and Mono- mials (102) Z x cos x dx = cos x + x sin x (103) Z x cos ax dx = 1 a 2 cos ax + x a sin ax (104) Z x 2 cos x dx =2 x cos x + ( x 2 - 2 ) sin x (105) Z x 2 cos ax dx = 2 x cos ax a 2 + a 2 x 2 - 2 a 3 sin ax (106) Z x n cos xdx = - 1 2 (i) n+1 [Γ(n +1, -ix)+(-1) n Γ(n +1, ix)] 11