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21 January, 19:30

Q: A: If 0° ≤ θ ≤ 90° and cosθ = 11 15, what is the value of sin (90° - θ) ?

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  1. 21 January, 19:34
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    Cos Ф = 11/5. Calculate the value of angle Ф:

    cos⁻¹ (11/15) = 42.83342807°

    sin (90-Ф) = sin (90-42.83342807) = sin (47.16657193) = 11/5

    So cos Ф = sin (90-Ф) = 11/15
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