If 3 tan `theta tan phi=1, ` then `(cos (theta-phi))/(cos (theta+phi))` is

A

`1/2`

B

2

C

`1/3`

D

3

Verified by Experts

The correct Answer is:

B

Similar Questions

Explore conceptually related problems

If 3tan theta tan phi=1 then (cos(theta-phi))/(cos(theta+phi)) is

3tanthetatanphi=1 , then (cos(theta-phi))/(cos(theta+phi))=?

If 3tan theta tan phi=1. Prove that 2cos(theta+phi)=cos(theta-phi)

If 3tan theta tan phi=1, then prove that 2cos(theta+phi)+cos(theta-phi)=0

If 3 tan theta tan phi=1 , then prove that 2 cos (theta+varphi)=cos (theta-varphi) .

If tan theta=1/2 and tan phi=1/3, then tan(2 theta+phi)

If (1+tan theta)(1+tan phi)=2 then theta+phi=

If tan theta+tan phi=a and cot theta+cot phi=b then cot(theta+phi)=

If 0 lt theta , phi lt pi and 8 cos theta cos phi cos (theta + phi)+1=0 find theta and phi