Evaluate $ \cos \frac{u}{2} $ assuming that u is in the interval $ \left(\frac{\pi}{2}, \pi\right) $ and $ \sin u=\frac{1}{2} $ . Give the exact answer.

Name: Evaluate $ \cos \frac{u}{2} $ assuming that u is in the interval $ \left(\frac{\pi}{2}, \pi\right) $ and $ \sin u=\frac{1}{2} $ . Give the exact answer.
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Question

Evaluate  $ \cos \frac{u}{2} $  assuming that u is in the interval $ \left(\frac{\pi}{2}, \pi\right) $  and  $ \sin u=\frac{1}{2} $  . Give the exact answer.

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The Answer of Evaluate  $ \cos \frac{u}{2} $  assuming that u is in the interval $ \left(\frac{\pi}{2}, \pi\right) $  and  $ \sin u=\frac{1}{2} $  . Give the exact answer.

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