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Mathematics 8 Online
OpenStudy (anonymous):

sec^4x-tan^4x=sec^2x+tan^2x proof

OpenStudy (fifciol):

\[\sec^4x-\tan^4x=(\sec^2x+\tan^2x)(\sec^2x-\tan^2x)\] and \[\sec^2x-\tan^2x=1\]

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