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18 June, 20:52

If cosx is approximately 0.9511, what is the measurement of x to the nearest degree? Approximately, what is the sin of the angle that is complementary to x?

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  1. 18 June, 21:19
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    Cosx ≈ 0.9511, so arccos (0.9511) ≈ x, so x≈18°

    the complementary angle of x is y=90°-18°=72°

    its sinus is sin72° = 0.951
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