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Trigonometry Angles--Pi/2 -- from Wolfram MathWorld
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If sin x = 1/2 and x is between pi/2 and 3pi/2, what is the value of x/2? (The answer key says it is 5pi/12, but I have no clue how to
Cos pi/2 - Find Value of Cos pi/2 | Cos π/2
