Question

$( \sec + \tan + 1)( \sec - \tan + 1) = 2 \tan$
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Answer 1

(Sec+1)^2 - tan^2
(Sec^2 + 1 +2sec) - (tan^2)
(Sec^2 + 1 +2sec) - (sec^2 +1)
Sec^2 +1 + 2sec -sec^2 -1
2sec

There fore the answer is 2secø and not 2tanø

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