Sara S.

asked • 11/17/20

Using a double-angle or half-angle formula to simplify the given expressions.

Using a double-angle or half-angle formula to simplify the given expressions.


(a) If cos2(27∘)−sin2(27∘)=cos(A∘), 


thenA=    degrees.


(b) If cos2(7x)−sin2(7x)=cos(B), 


thenB=    .

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