# Math Help - Trig Exact Values

1. ## Trig Exact Values

How would you find the exact values for sin(67.5)?

2. Originally Posted by PDBear
How would you find the exact values for sin(67.5)?
Use half-angle identity $\sin \frac{x}{2}=\pm \sqrt{\frac{1 - \cos x}{2}}$

Now find $\sin\left(\frac{135}{2}\right)$