# Thread: proving the indefinite integral of secant

1. ## proving the indefinite integral of secant

There was a discrepancy in class as to the correct indefinate integral of secant between these 2 below. My teacher actually thinks both them are correct, but i honestly have no idea how. Could anyone help point out how they are both can be right?

and

2. See attached for the first answer.

For the second one, apply u-substitution as shown step by step at:
Integral sec(x)

Good luck!

3. amazing. thank you.