sec^4A-tan^4A = 1+2sin^2A
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I will do it today
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Answer:
sec^4A - tan^4A
= (sec^2A)^2 - (tan^2A)^2
= (sec^2A - tan^2A)(sec^2A + tan^2A)
= 1((sec^2A + tan^2A)
= (sec^2A + tan^2A)
= 1/cos^2A + sin^2A/Cos^2A
= (1+sin^2A)/cos^2A
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