Posted by **ama** on Friday, July 6, 2012 at 2:14am.

write each expression as the sine, cosine or tangent of a double angle. then find the exact value of the expression.

a. 2sin 22.5 cos 22.5

b. cos^2 105- sin^2 105

## Answer this Question

## Related Questions

- MATH - 1.)Find the exact solution algebriacally, if possible: (PLEASE SHOW ALL ...
- Trig - Using a double angle formula how would you find the exact value of this ...
- trig - Write the expression as the sine, cosine, or tangent of a double angle. ...
- Math- Trig - 1. Determine the exact value of cos^-1 (pi/2). Give number and ...
- Pre-Calc - I am really struggling with how to do these problems, I posted them a...
- Pre-Calc - 1) Use an Addition or Subtraction Formula to write the expression as ...
- precalculus - Write each expression as sine, cosine, or tangent of an angle. ...
- Math 2nd question - Express as a single sine or cosine function (note: this is ...
- precalculus - Write the trigonometric expression in terms of sine and cosine, ...
- trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...