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Trigonometry half angles? u is in the interval (pi, 3pi/2), sin(u) = -1/7 What is sin(u/2)?

A http://www.door2math.com production. Trigonometry half angles? u is in the interval (pi, 3pi/2), sin(u) = -1/7 What is sin(u/2)? What is cos(u/2)? What is tan(u/2)?
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