SOLUTION: If cos α= -1/2 then find sin α if tan α is negative.

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Question 1186265: If cos α= -1/2 then find sin α if tan α is negative.
Answer by ikleyn(52908) About Me  (Show Source):
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If cos α= -1/2 then find sin α if tan α is negative.
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As described,  the angle  alpha  is in the 2-nd quadrant  and is equal to  2pi%2F3.


Hence,  sin%28alpha%29 = sqrt%283%29%2F2.    ANSWER


Solved.