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Best Answer: You're wrong about what the arctan function is. arctan is that function that answers the question, What angle theta yields the tan (theta) = x? arctan 0 = 0 because the tan 0 = sin 0 / cos 0 = 0/1 = 0.
Prototype: double atan(double a_tan); Header File: math.h (C) or cmath (C++). Explanation: Acos is used to find the arctangent of a number (give it a tangent value and it will return the angle, in radians corresponding to that value). It accepts all real numbers.