SOLUTION: Simplify the expression by using a double-angle formula. {{{ cos^2(4)theta-sin^2(4)theta }}}

Algebra ->  Trigonometry-basics -> SOLUTION: Simplify the expression by using a double-angle formula. {{{ cos^2(4)theta-sin^2(4)theta }}}      Log On


   

Question 985825: Simplify the expression by using a double-angle formula.
+cos%5E2%284%29theta-sin%5E2%284%29theta+
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Not clear.
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cos%282x%29+=+cos%5E2%28x%29+-+sin%5E2%28x%29
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Go to Wikipedia, see Half Angle Formula