- #1

KAISER91

- 27

- 0

## Homework Statement

Evaluate;

∫ x sec^2 x dx

## Homework Equations

## The Attempt at a Solution

So far this is what I have;

u = x

du/dx = 1

du = 1 dx

dv = sec^2 x

v = tan x

Therefore;

= x tan x - ∫ tan x dx

= x tan x - ln (sec x) + c

I stopped there thinking that was the answer?

The answer given is

x tan x + ln (cos x) + c

Thanks