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13 June, 19:30

Cos (-θ) = √3/4, sinθ<0 What is the value of sinθ?

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Answers (2)
  1. 13 June, 19:32
    0
    Since the length OQ = cos θ is the x-coordinate of P, and PQ = sin θ i
  2. 13 June, 19:55
    0
    Hello:

    Cos (-θ) = √3/4

    Cos (θ) = √ (3) / 2

    sinθ = - 1/2

    θ = π + π/6 = 7 π/6

    θ = 2π - π/6 = 11π/6
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