The answer is simply that zero minus (-1) equals 1. 3. Likewise functions with x 2 or x 3 etc will also approach infinity. I remember him looking at me with a condescending look, shaking his head slowly, not saying a word, and then moving on with his lecture. The arctangent is the inverse tangent function. IEEE 754-1985 was an industry standard for representing floating-point numbers in computers, officially adopted in 1985 and superseded in 2008 by IEEE 754-2008, and then again in 2019 by minor revision IEEE 754-2019. The missing (-1) causes zero to transform into the value 1. arctan(∞) = ? Example: 2x 2 −5x. Rational Functions Reduce to a common denominator. technically, infinity is not a value and therefore cannot be defined as minus 1. Negative zero has the sign bit set to one. Functions like 1/x approach 0 as x approaches infinity. If zero contains all numbers within it, and we take away a value, zero then contains all numbers except the removed value. One may obtain negative zero as the result of certain computations, for instance as the result of arithmetic underflow on a negative number, or −1.0×0.0, or simply as −0.0.. The limit of arctangent of x when x is approaching infinity is equal to pi/2 radians or 90 degrees: The limit of arctangent of x when x is approaching minus infinity is equal to -pi/2 radians or -90 degrees: In IEEE 754 binary floating-point numbers, zero values are represented by the biased exponent and significand both being zero. This is also true for 1/x 2 etc : A function such as x will approach infinity, as well as 2x, or x/9 and so on. Infinity Minus Infinity 1. 2. In this case we might be tempted to say that the limit is infinity (because of the infinity in the numerator), zero (because of the infinity in the denominator) or -1 (because something divided by itself is one). Irrational Functions Multiply and divide by the conjugate. What is the arctangent of infinity and minus infinity? 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