# Trig Exact Values

• November 3rd 2008, 11:25 AM
PDBear
Trig Exact Values
How would you find the exact values for sin(67.5)?
• November 3rd 2008, 02:04 PM
masters
Quote:

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