SOLUTION: Step by step expanation? Given cos (theta) = -15/17 and 180 < theta < 270, find the exact value of sin (theta/2)?

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Question 1024808: Step by step expanation?
Given cos (theta) = -15/17 and 180 < theta < 270, find the exact value of sin (theta/2)?

Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Start with the Pythagorean Identity:





For your problem, the angle is restricted to Quadrant III, where both cosine and sine are negative.

John

My calculator said it, I believe it, that settles it