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    If cos x = - ½ and x lies in the third quadrant, then tan x is:
    Question

    If cos x = - ½ and x lies in the third quadrant, then tan x is:

    A.

    √3

    B.

    3/2

    C.

    2/3

    D.

    1/3

    Correct option is A

    Solution:
    cos x = -1/2
    cos x = cos (180 + 60)
    cos x = cos 240
    x = 240°
    tan 240° = tan (180 + 60)
    tan 60° = √3
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