SOLUTION: If cos A = 1/3 , find sin (A/2) if ∠A is ACUTE.

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Question 1117287: If cos A = 1/3 , find sin (A/2) if ∠A is ACUTE.

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


Half-angle formula:



So



You can do your own arithmetic. My advice is to leave the answer in radical form AFTER you rationalize your denominator.

John

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