SOLUTION: Using a double-angle or half-angle formula to simplify the given expressions.
if cos^2(25∘)−sin^2(25∘)=cos(A∘) then A= . If cos^2(9x)−sin^2(9x)=cos(B) then B=
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Question 1170546: Using a double-angle or half-angle formula to simplify the given expressions.
if cos^2(25∘)−sin^2(25∘)=cos(A∘) then A= . If cos^2(9x)−sin^2(9x)=cos(B) then B= . I have tried cos(50) for cos^2(25 deg)-sin^2(25deg)=cos (A deg).
Answer by greenestamps(13216) (Show Source): You can put this solution on YOUR website!
The double angle formula is
So
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