
The signum function simply gives the sign for the given values of x. For x value greater than zero, the value of the output is +1, for x value lesser than zero, the value of the output is -1, and for x value equal to zero, the output is equal to zero. The signum function can be defined and understood from the below expression.
Let us consider x. The function sgn x yielding a real number, is defined by:
sgn x = 1 if 0 < x, sgn x = -1 if x < 0, sgn x = 0, otherwise.
The following propositions are true:

Example 1: Find the result for the values of x, using the signum function
x = {- 4.93, - 7.66, 12, 0, 4.2, 2.33333, -8.10}
Solution: Here we use the following signum function to find the output, for the input values of x.
x = {- 4.93, - 7.66, 12, 0, 4.2, 2.33333, -8.10}
Output = {-1,-1,+1,0,+1,+1,-1}
Now, -1 ≤ sinx ≤ 1
⟹ 0 ≤ sinx + 1 ≤ 2
⟹ 0 ≤ (sinx + 1)² ≤ 4
⟹ 2 ≤ (sinx + 1)² + 2 ≤ 6
Let’s take a some negative values as the domain of this function x = {-2,- 3,- 5}.
Applying these values for the signum function we have f(-2)= -1,
f(-3)= -1,f(-5)= -1.
Here, the range or the answer for all the negative values of x is always -1, which is a constant value.
Hence proved.
Solution:
To find the domain let us look at every values x can take here.
We found that division by zero isn't defined.
So the denominator of a function can't be zero.
This gives, x-3≠0
Addition of 3 on both sides, we get, x≠3
So the main value which couldn't be taken by x is 3.
This gives the domain contains the set of all real numbers aside from 3, that is R-{3}..
Now the range is the set of all values taken by f(x).
JEE Main marks vs rank vs percentile
JEE Advanced Eligibility Criteria
JEE Advanced Chemistry Syllabus
JEE Advanced Registration Dates
Derivation Of Lens Maker Formula
Unit Of Pressure Velocity Uses of Plane Mirror
Wave Theory of Light
Unit of Density Unit of Light Unit of Force Unit of Magnetic Field Unit of wavelength Unit of Viscosity Uses of Electroplating Young's Modulus
What is the Scattering of Light
Lenz Law Space Wave Propagation Schrodinger Wave Equation Relation between Fahrenheit and Celsius Refractive Index Potentiometer Working Pascal Law Oscillatory Motion Optical Instruments Newton's Laws of Motion - First Law Modulation and Demodulation Magnetic Flux Lens Formula and Magnification Kaleidoscope Faradays Law Epsilon Naught Value Energy Bands Electrostatics Electroscope AC Generator Unit of Current Lithosphere Bending Equation Derivation Difference Between Pound and Kilogram Semiconductor Devices OTEC - Ocean Thermal Energy Conversion Hall Effect Rectilinear Propagation of Light Difference Between Ammeter and Voltmeter Coefficient of Linear Expansion Ampere’s Law Cyclone and Thunderstorm Save The Environment From Pollution Particle Nature of Light Types of DC Motor Uses Of Transistor Derivation of Phase Rule Unit of Humidity