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) (Show Source): You can put this solution on YOUR website!
Half-angle formula:
\ =\ \sqrt{\frac{1\ -\ \cos{\varphi}}{2}})
So
\ =\ \sqrt{\frac{1\ -\ \frac{1}{3}}{2}})
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
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