If sec θ + tan θ = 3, then the value of sec θ is :
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Correct answer: D
Explanation
The correct answer is option 4 i.e.
We know that,
sec θ + tan θ = 3.........(1)
sec θ + tan θ = x then sec θ - tan θ = 1/x.
sec θ - tan θ = 1/3.......(2)
On adding eq(1) and (2) we get,
2 secθ = 10/3
secθ = 5/3.