Integration problem

[DaveD]

Can you help
I am trying to integrate 1/(cos x)^2

ive tried using the substitution cos2x - 2cos^2 x -1 but not getting anywhere.

Thanks

[Unregistered]

which module?

[KatieB]

change 1/cos^2(x) to (secx)^2 then integrate

the integral of (secx)^2 is tan x