SOLUTION: Write {{{ cos^2 (theta/8) - sin^2 (theta/8) }}} as a single trigonometric ratio.
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Question 955346: Write as a single trigonometric ratio.
Answer by cobetta1(1) (Show Source): You can put this solution on YOUR website!
Cos ^2(theta /8)-sin ^2( theta/8) "recall"( sin^2(theta)+cos^2(theta)=1) =Cos^2(theta /8)-(1-cos^2(theta /8))= cos^2(theta /8)+cos^2(theta /8)-1 = 2cos^2(theta /8)-1
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