- #1
Uniquebum
- 55
- 1
My problem is:
Proof [itex]sin(\frac{x}{2}) = \pm \sqrt{\frac{1-cos(x)}{2}}[/itex]
Simple issue really i'd think but i can't come up with a way.
For starters i'd use however
[itex]cos^2(x) + sin^2(x) = 1[/itex] identity.
Which evidently would lead into
[itex]sin(\frac{x}{2}) = \pm \sqrt{1-cos^2(\frac{x}{2})}[/itex]
But then i got nothing...
Proof [itex]sin(\frac{x}{2}) = \pm \sqrt{\frac{1-cos(x)}{2}}[/itex]
Simple issue really i'd think but i can't come up with a way.
For starters i'd use however
[itex]cos^2(x) + sin^2(x) = 1[/itex] identity.
Which evidently would lead into
[itex]sin(\frac{x}{2}) = \pm \sqrt{1-cos^2(\frac{x}{2})}[/itex]
But then i got nothing...