Posted by **Moe** on Saturday, April 27, 2013 at 9:56pm.

If cos θ = c, then sinēθ/2 equals

1) 1-c/2

2) 1+c/2

3) 1-c/c+c

4) 1-c/4

- Algebra 2/ Trigonometry -
**Damon**, Saturday, April 27, 2013 at 10:51pm
cos^2 = c I suspect typo

1 - sin^2 = c

sin^2 = 1 - c

sin^2 /2 = (1-c)/2 not 1 - c/2

I am not a mind reader. Please check what you type to make sure it makes sense.

- Algebra 2/ Trigonometry -
**Moe**, Sunday, April 28, 2013 at 11:50am
I typed what i wrote correctly these questions are from a work sheet therefore your smart comments aren't needed if you simply can not solve it, just don't post.

## Answer This Question

## Related Questions

- Math - Calculus - The identity below is significant because it relates 3 ...
- Trigonometry - Which of the following is equivalent to 1 − cos 2 θ/...
- trigonometry - if cosθ=2/3 and tanθ<0 find the exact value sin(&#...
- math - if cosθ=2/3 and tanθ<0 find the exact value sin(θ-5&#...
- trigonometry - tanθ= -2sqrt10/3 and π/2<θ< π find a. ...
- Trigonometry - There are four complex fourth roots to the number 4−4√...
- trigonometry - can someone help me prove the identities on this: 1- 1/2 sin2&#...
- trigonometry - given tanθ= -2√10/3 and π/2<θ< π ...
- precalculus - sinθ=12/13, θ lies in quadrant II. Find the exact value...
- Pre-Calculus - If θ represents an angle such that sin2θ = tanθ - ...

More Related Questions