(sec4x-1)/tan2x =(sec2x-1)(sec2x+1)/tan2x=sec2x+1=2+tan2x
QED
Bridget M.
asked 02/01/19(sec^4x-1)/(tan^2x)=tan^2x+2
(sec4x-1)/tan2x =(sec2x-1)(sec2x+1)/tan2x=sec2x+1=2+tan2x
QED
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