Find the intergral of 1/[cos(^2) x

Question

bobpursley · Answer

What is the derivative of tan x ? (do it as a u/v,or sinx/cosx) remember that cos^2+sin^2x is 1.

Claire · Answer

Can you please explain how to work it because I still cannot understand.

drwls · Answer

Since the derivative of tan x is sec^2 x (which is 1/cos^2 x) , the integral of 1/cos^2 x must be tan x. That is what BobPursley was saying.