Camila J.

asked • 06/01/21

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 cos^2(31∘) − sin^2(31∘)=cos(A∘), 


then A=____    degrees


(b) If cos^2(5x) − sin^2(5x)=cos(B), then


B=  ___  .

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