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    If Tan θ + Sec θ = a, then what is Sec θ equal to:
    Question

    If Tan θ + Sec θ = a, then what is Sec θ equal to:

    A.


    B.


    C.


    D.


    Correct option is D

    Tan θ + Sec θ = a
    Concept :
    Tan θ + Sec θ = 1/Tan θ - Sec θ
    Sec θ - Tan θ = 1/a ....(1)
    Tan θ + Sec θ = a ...(2)
    Solving both 1 and 2,
    2 Sec θ = a + 1/a
    2 Sec θ = (a2 + 1)/a
    Sec θ = (a2 + 1)/2a

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