Posted by Hannah on Saturday, February 27, 2010 at 10:38pm.
1) Verify the identity
cos^2 B  sin^2 B = 2 cos^2 B 1
I know that cos^2 B  sin^2 B = 2 cos^2 B 1 by the double angle formula but I do not know how to show this.

PreCal  Reiny, Saturday, February 27, 2010 at 10:41pm
LS =
cos^2 B  sin^2 B
= cos^2 B  (1  cos^2 B)
= 2cos^2 B  1
= RS