If `tan gamma=sec alpha sec beta+tan alpha tan beta,` then `cos2 gamma` is necessarily (A) `ge0` (B) `le0` (C) `lt0` (D) `gt0`

If x sec alpha+y tan alpha=x sec beta+y tan beta=a , then sec alpha*sec beta=

If cos(alpha + gamma)/cos(alpha - gamma) = cos 2beta then tan alpha, tan beta and tan gamma are

If alpha+beta=90^(@) and beta+gamma=alpha then tan alpha-tan beta=?

If alpha+ beta + gamma=90^(@) , then tan alpha+ tan beta + tan alpha tan beta cot gamma is __________

If 2 sin alpha cos beta sin gamma=sin beta sin(alpha+gamma) then tan alpha , tan beta, tan gamma are in A) A.P.B) G.P.C) H.P.D) None of these

If 2 sin alphacos beta sin gamma=sinbeta sin(alpha+gamma),then tan alpha,tan beta and gamma are in

What is (1+tan alpha tan beta)^2+(tan alpha-tan beta)^2-sec^2 alpha" "sec^2beta equal to?

sin alpha sin beta-cos alpha cos beta=1 then show that tan alpha+tan beta=0

If tan beta=2sin alpha sin gamma co sec(alpha+gamma) , then cot alpha,cot beta,cotgamma are in