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27 February, 03:30

Csc (theta), if cos (theta) = - 2/3; 180 < theta < 270

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  1. 27 February, 03:50
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    Opposite side = sqrt (3^2 - 2^2) = sqrt5

    sin theta = - sqrt 5 / 3 as the sine is negative in the 3rd quadrant

    csc theta = - 3 / sqrt5
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