If cosA= -15/17 and A is in quadrant III, find cos 1/2A

If cosA= -15/17 and A is in quadrant III, find cos 1/2A

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ya you have the value of cos A
try to use the formula of cos 2A to get to the answer!!

@sarihmanlapaz did you try that?

what will i use in the 3 formula of cos2a?

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