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28 January, 09:06

If sin 0 = 15/17 use pythagorean identity to find cos 0

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  1. 28 January, 09:32
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    Hello:

    sin θ = 15/17

    use pythagorean identity : cos²θ + sin² θ = 1

    cos²θ = 1 - sin² θ

    cos²θ = 1 - (15/17) ²

    cos²θ = 1 - 225/289

    cos²θ = 64/289

    cos²θ = (8/17) ²

    cosθ = 8/17 or - 8/17
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