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View Full Version : write the expression in terms of a single trig. Function

crmedina23
May 12, 2012, 09:30 PM
cos^2 2 theta-sin^2 2 theta
ebaines
May 13, 2012, 06:50 PM
cos^2 2 theta-sin^2 2 theta

Hint: remember the identity for cos(2x): one version is cos(2x) = cos^2x - sin^2x