use the identity to write the expression as a single trig fu

use the identity to write the expression as a single trig function or as a single number.

Use the identity to write the expression as a single trig function or as a single number. Sin22.5 degree cos22.5 degree

Solution

sin22.5 *cos 22.5

multiply and divide by 2:

( 2*sin22.5 *cos 22.5 ) / 2 [ sin 2A = 2*sin A *cos A]

sin ( 2*22.5) / 2

(sin 45)/2

= 0.353