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8 January, 08:56

If sin of beta = 4/7, what is cos of beta?

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  1. 8 January, 10:54
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    Sin²β + cos²β=1

    cos²β=1-sin²β

    cos²β=1 - (4/7) ²

    cos²β=1-16/49=49/49-16/49=33/49

    cosβ=√33/√49=√33/7
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