# Parametric Equation

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```					                      Parametric Equation
Parametric Equation

In mathematics, parametric equation is a method of defining a relation using
parameters.

A simple kinematic example uses a time parameter to determine the position,
velocity, and other information about a body in motion.

Abstractly, a parametric equation defines a relation as a set of equations.
Therefore, it is somewhat more accurately defined as a parametric representation.
It is part of regular parametric representation.

In plane, parametric equation is a pair of Functions which is given by:

⇒x = f (s) and y = g (s); which is used to define the ‘x’ and ‘y’ coordinate graph of
the given curve in the plane.

In mathematics, a Set of equations which is used to represent a set of quantities
as unambiguous Functions of a number of independent variables, said to be
parameters.
Know More About :- Second Derivative of Tanx

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For example, Circle equation in the Cartesian coordinate is given by:

r2 = x2 + y2, and Circle equation for the Parametric Equations is given by:

⇒x = r cos s;

⇒y = r sin s;

Basically the parametric equation is represented as non unique, so the same
quantities are defined by number of different parameterizations. Now we will see
two dimensional and three dimensional parametric equations.

In the two dimensional parametric equations Parabola and circle are involved.

Parabola: The equation of parabola is given by:

⇒y = x2;

The given equation is parameterising using the other parameter, when we use
another parameter then the equation of parabola is:

⇒x = s and,

⇒y = s2.

In case of circle, the ordinary Equation of Circle is given by:

⇒x2+ y2 = 1;

Here we obtained the equation which is parameterized.

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Using the parameterize version it is very easy to get points on a plot. Let’s talk
about the three dimensional parametric equations. ‘Helix’ include in the three
dimensional parametric equation.

Generally parametric equation is used to define the curve in higher- dimensional
space.

For example: x = a cos (s),

⇒y = a sin (s);

⇒z = bs;

Given equation defines a three dimensional curve, the radius of Helix ‘a’ and riser
to 2b unit per turn.

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