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5 February, 00:30

Cos A = 0.83 and cos B = 0.55. What is sin A + sin B?

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  1. 5 February, 02:25
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    If the cos A =.83 then the arc cosine of. 83 equals the angle

    arc cosine (.83) = 33.901 degrees

    Similarly, we look up the arc cosine of. 55

    arc cosine (.55) = 56.633 degrees

    NOW we can look up the sine of 33.901 degrees and find it is the

    sine of A and it equals 0.55776

    the sine of 56.633 degrees = 0.83516 and that is the sine of B
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