Math.Acos()
Returns the angle whose cosine is the specified number between -1 and 1. If you pass a number outside of this range to the Math.Acos() method, the method will return NaN (Not a Number).
Returns the angle whose cosine is the specified number between -1 and 1. If you pass a number outside of this range to the Math.Acos() method, the method will return NaN (Not a Number).
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