SOLUTION: Use the given information to find cos(x/2), sin(x/2), and tan(x/2):
Cos (x)=-12/13
180 degrees< x < 270 degrees
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Question 1131102: Use the given information to find cos(x/2), sin(x/2), and tan(x/2):
Cos (x)=-12/13
180 degrees< x < 270 degrees
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
If your given angle is in the range 
, then the half angle must be in the range 
, hence the cosine and tangent will be negative and the sine positive.
John
My calculator said it, I believe it, that settles it
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