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16 March, 14:52

What values for θ (0 ≤ θ ≤ 2pie) satisfy the equation?

2 sin θ cos θ + Sqr3 cos θ = 0

a.) pie/2, 4pie/3, 3pie/2, 5pie/3

b.) pie/2, 3pie/4, 3pie/2, 5pie/3

c.) pie/2, 3pie/4, 3pie/2, 5pie/4

d.) pie/2, pie/4, 3pie/2, 5pie/3

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Answers (1)
  1. 16 March, 15:08
    0
    Factor out the cos θ:

    cosθ (2sin θ + sqrt3) = 0

    Therefore, the only ways this can happen are if either cosθ = 0 or if (2sin θ + sqrt3) = 0

    The first case, cosθ = 0 only at θ = pi/2, 3pi/2.

    The second case, (2sin θ + sqrt3) = 0 simplifies to:

    sin θ = (-sqrt3) / 2

    θ = 4pi/3, 5pi/3

    Therefore the answer is A.
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