Question

Integrals of (sec^(2)(x))/(tan(x))?

Answer 1

`lntanx+C`

Explanation:

`intsec^2x/tanxdx`

`color(green)(intsec^2xdx=intd(tanx)`

`=int(d(tanx))/tanx`

now substitute `u=tanx`

`int(du)/u=lnu`

Reverse The substitution

`=lntanx+C`