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Why do the trig functions like Sin() and Cos() give the wrong answers?

April 26, 2017answers COS functions Sin trig wrong

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Why do the trig functions like Sin() and Cos() give the wrong answers?

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While most people express angles in degrees, the trig functions expect their arguments to be in radians. For historical reasons, a complete rotation is 360 degrees; for more cosmological reasons, the same complete rotation is 2 * Pi radians (the circumference of a circle with a radius of 1).