Question
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
Answer: Option A
:
A
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:
A
(a,b) If L=M, then L2 = LM or ML = M2
Both LM = ML = 1 as sec2A - tan2A = 1
∴L2 = M2 = 1.
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