Hi, I was solving an integral and got this substitution

t= tg(x/2) then sin(x) = (2t)/(1+t^2) and cos(x) = (1-t^2)/(1+t^2)

How did I get sin(x) = (2t)/(1+t^2)?

I know that t = sinx/(cosx+1) and sinx = [(cosx+1)*t]

Results 1 to 4 of 4

- June 18th 2013, 12:27 PM #1

- Joined
- May 2013
- From
- Uruguay
- Posts
- 4
- Thanks
- 1

- June 18th 2013, 01:54 PM #2

- Joined
- Apr 2005
- Posts
- 16,055
- Thanks
- 1684

- June 18th 2013, 03:53 PM #3

- Joined
- Jun 2009
- Posts
- 660
- Thanks
- 133

- June 27th 2013, 11:42 AM #4

- Joined
- May 2013
- From
- Uruguay
- Posts
- 4
- Thanks
- 1