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Q.

If cos2B=cos(A+C)cos(AC) , then tanA,tanB,tanC  are in 

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a

H.P

b

are in no progression

c

G.P

d

A.P

answer is B.

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Detailed Solution

cos2B1=cos(A+C)cos(AC)1cos2B1+cos2B=cos(AC)cos(A+C)cos(AC)+cos(A+C)

 By the method of componendo and dividendo)

2sin2B2cos2B=2sinAsinC2cosAcosC tan2B=tanAtanC
 

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If cos2B=cos(A+C)cos(A−C) , then tanA,tanB,tanC  are in