Indefinite IntegrationHard

Question

The integral equals (for some arbitrary constant K)

Options

A.
B.
C.
D.

Solution


Let sec x + tan x = t
⇒ sec x - tan x = 1/t
Now (sec x tan x + sec2 x) dx = dt
sec x (sec x + tan x) dx = dt
sec x dx = = sec x






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