The various indefinite integral formulae which must be remembered as they are extremely helpful in solving problems include:
1) ∫ exdx = ex + c
2) ∫ 1/x dx = ln |x| + c
3) ∫ ax dx = ax/ ln a + c (a > 0)
4) ∫ cos x dx = sin x + c
5) ∫ sin x dx = - cos x + c
6) ∫ sec2 x dx = tan x + c
7) ∫ cosec x cot x dx = - cosec x + c
8) ∫sec x tan x dx = sec x + c
9) ∫ cosec2 x dx = - cot x + c