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Trig

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The set of solution(s) of 2 cos^2
(θ) - 13 cos(θ) + 6 = 0 that is(are) in the
interval (0,π/2) is one of following
a. {π/6} b. {π/3}
c. {π/4}
d. {π/3, π/6}
e. {π/6, π/4}

  • Trig - ,

    This is just a quadratic in cosθ

    2cos^2θ - 13cosθ + 6 = 0
    (2cosθ - 1)(cosθ - 6) = 0

    so,
    2cosθ = 1
    cosθ = 1/2
    θ = π/3

    or,
    cosθ = 6
    no solutions there

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