SOLUTION: Question--> cos^2(15)-sin^2(15) equals: I know that sin^2(x)+cos^2(x)=1, but am not sure how to manipulate this or other trig identities to find the answer to the question above

Question 1085160: Question--> cos^2(15)-sin^2(15) equals:
I know that sin^2(x)+cos^2(x)=1, but am not sure how to manipulate this or other trig identities to find the answer to the question above.
Thank you in advance!
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
I know that sin^2(x)+cos^2(x)=1, but am not sure how to manipulate this or other trig identities to find the answer to the question
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cos^2(x) - sin^2(x) = cos(2x)
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