SOLUTION: How do I write the following as a single trigonometric equation? : cos^2(1/2)theta - sin^2(1/2)theta ? Thank you

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Question 645664: How do I write the following as a single trigonometric equation? :
cos^2(1/2)theta - sin^2(1/2)theta ?
Thank you
Answer by lwsshak3(6494) About Me  (Show Source):
You can put this solution on YOUR website!
How do I write the following as a single trigonometric equation? :
cos^2(1/2)theta - sin^2(1/2)theta
**
Identity: cos 2s=cos^2s-sin^2s
for given problem:
cos^2(1/2)theta - sin^2(1/2)theta
=cos2*(1/2)theta
=cos theta