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3 November, 00:40

Cos theta=10/26, theta lies in quadrant IV

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  1. 3 November, 03:11
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    Cos (theta) = 10/26=5/13

    acos (5/13) = 1.176 radians = 67.4 degrees

    Since it is in the fourth quadrant, the angle is - 67.4 degrees
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