Asked by Claire

Find the intergral of 1/[cos(^2) x
Answered by bobpursley
What is the derivative of tan x ? (do it as a u/v,or sinx/cosx)
remember that cos^2+sin^2x is 1.
Answered by Claire
Can you please explain how to work it because I still cannot understand.
Answered by drwls
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.
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