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If (sec A + tan A) (sec B + tan B) (sec ...

If `(sec A + tan A) (sec B + tan B) (sec C + tan C) = (sec A-tan A) (sec B-tan B) (sec C-tan C)` then each side is equal to

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If (sec A + tan A)(sec B + tan B)(sec C + tan C) = (sec A- tan A)(sec B- tan B)(sec C tan C) Prove that each side is equal to +-1.

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(1)/(sec A-tan A)=sec A+tan A

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