Posted by Abbey on Monday, March 8, 2010 at 5:13pm.
1) Use the halfangle formulas to determine the exact values of the sine, cosine, and tangent of the angle.
67 degrees 30'

PreCal(Please help)  drwls, Monday, March 8, 2010 at 5:37pm
Use the half angle formulas at
http://www.sosmath.com/trig/douangl/douangl.html
The sine of the full angle (135 deg) is 1/sqrt2 and the cosing is 1/sqrt2