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31 October, 13:29

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

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  1. 31 October, 16:17
    0
    The same value as cosα

    cosα=sin (90-α) and vice versa

    sinα=cos (90-α)
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