integration with sec and tan... dont understand 2 lines in a worked solution. (1 Viewer)

[school4nerds]

Hi,

I'm having trouble understanding how "int(sec^2x.tan^(n-2)x dx" beocmes " tan^(n-1)x/(n-1)". Its a part of a worked solution.

can someone please explain to me?

thanks

 

[deswa1]

Let u=tanx and go from there.

 

[school4nerds]

Let u=tanx and go from there.

thank you!