If sinA = 2/3 find cos A/2 =? need help ASAP

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If sinA = 2/3 find cos A/2 =? need help ASAP

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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HI!!
first find \(\cos(A)\)
then use \[\cos(\frac{A}{2})=\sqrt{\frac{1+\cos(A)}{2}}\]

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HOW to get cos A?
draw a triangle
|dw:1438137818903:dw|
there is a picture on an angle whose sine is \(\frac{2}{3}\) find the third side via pythagoras
once you have the missing side, you know the cosine let me know when you get it
Oh i get it ... i'll give it a try... with some other exercises
Waiting for lynfran's reply

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