In a triangle ABC, if cos A = cos B × cos C, What is the value of ta – McqOptions

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1.	In a triangle ABC, if cos A = cos B × cos C, What is the value of tan A- tan B - tan C?
A.	- 1
B.	0
C.	1+ tan A – tan B – tan C .
D.	tan A tan B tan C - 1
Answer» C. 1+ tan A – tan B – tan C .

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