Mark the Correct alternative in the following:
If 2 tan α = 3 tan β, then tan (α - β) =
Given, 2 tan α = 3 tan β
From here we get, ------ (1)
Now consider tan (α - β),
The expansion of tan (α - β) is given by
As we already know the value of tan α from equation (1), we have,
[ by using ]
Multiplying and dividing the equation with 2
[using sin2θ = 2 sinθ cosθ]
In the denominator adding and subtracting 1
[using cos2θ = 2cos2θ – 1]
Hence, in the question the answer matches with option A.