Multiple Choice Questions on If k sin theta cos2 theta 2k ndash 7 then find the value of sin theta ........ for CDS Exam Preparation

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Multiple Choice Questions

If k sin theta cos2 theta 2k ndash 7 then find the value of sin theta ........

Quantitative Aptitude (CDS) Quadratic Equations
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    If  k.sinθ + cos2θ = 2k – 7 then find the value of sinθ ?

    (k-2)/2

    Incorrect Answer

    (k+4)/4

    Incorrect Answer

    (k-4)/2

    Correct Answer

    2
     

    Incorrect Answer
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    Explanation:

    k sinθ+cos2θ=2k-7
    2sin²θ-ksinθ+2k-8=0
     x=(-b±√(b^2-4ac))/2a
    Sinθ = (k±(k-8))/4
    sinθ=(k-4)/2  & sinθ=2 ( not possible )

    By: bhavesh kumar singh
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