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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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