1.

(4(cos^4 A + sin^4 A))/(3 + cos 4A) = (cos^4 A - sin^4 A) * sec(2A)​

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Step-by-step EXPLANATION:

(4(COS^4 A + sin^4 A))/(3 + cos 4A) = (cos^4 A - sin^4 A) * SEC(2A)



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