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[(sec A+tan B)(sec B+tan B)(sec C+tan],[...

[(sec A+tan B)(sec B+tan B)(sec C+tan],[=(sec A-tan A)(sec B-tan B)(sec C-1],[" ,then each side is equal to "],[[" (A) "1,-1],[" (B) "-1,0],[" (C) "," None of these "]]

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