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29 March, 22:39

If sin x =.21, what is cos x?

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  1. 29 March, 23:04
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    Sinx = 0.21

    Using sin²x + cos²x = 1

    0.21² + cos²x = 1

    cos²x = 1 - 0.21 ² = 1 - 0.0441 = 0.9559

    cosx = √0.9559

    cosx ≈ + 0.978 or - 0.978
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