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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.
What is arctangent? Initial disclaimer: This is by no means intended to be a full-blown explanation of trigonometry or its functions. This is just a helpful service to everyone who is coming to arctangent.net presumably seeking help with this particular function. arctangent (atan or tan-1 on some calculators) is used to calculate the angles of a right triangle. It works opposite of the tangent function. While tangent will find the ratio of the two sides of a right triangle when given an angle, arctangent can find the angle given the ratio.