imo class 12 indefinite integration

∫x sec²x dx equals:

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∫x sec²x dx equals:

  • A. x tan x − ln|sec x| + C
  • B. x tan x + ln|cos x| + C
  • C. tan x + C
  • D. x sec x tan x + C

Answer: B) x tan x + ln|cos x| + C

Explanation: u = x, dv = sec²x dx. du = dx, v = tan x. ∫ = x tan x − ∫tan x dx = x tan x − (−ln|cos x|) + C = x tan x + ln|cos x| + C.

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