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Verify the Trigonometric Identity cos(x - pi/2) = sin(x) - YouTube
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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
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What are the terminal points determined by π/2, π, -π/2, and 2π?
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If theta = pi/2, determine the exact value of sin theta. | Homework.Study.com
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Trigonometry Angles--Pi/2 -- from Wolfram MathWorld
