# Math Help - more trig

1. ## more trig

prove each identity so L.S. = R.S.

1) sin x (divided by) 2 = 1-cosx(divided by)2 (right side of equation is all under square root sign)

2. have you tried using the trig identity, (cosx)^2 + (sinx)^2 = 1?

also is that (1-cosx)/2 or 1-cosx/2?

3. i dont think that identity applys to this one does it?

it is just the square root of 1-cos(theta) all over 2 = sin (theta) over 2

sin(theta) = 1-cos(theta) <- right side is all under a square root sign
2 2

hope that helps

thanks

4. yea i thats what i mean both sides are equal