Published by:
CGP EDU Academic Team
Published on: August 13, 2026
If A + B + C = π & cosA = cosB. cosC then tanB. tanC has the value equal to:
Text Solution
Verified by ExpertsThe correct answer is:
C
As cos A = cos B cos C, so ⇒ tan B tan C = 
= 
× sin B sin C
= 
(cos (B – C) – cos (B + C)) = 
(cos (B – C) + cos (B + C) – 2 cos (B + C))
= 
{(2 cos A – 2 cos (B + C)} = 
= 2
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