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# Fundamentals of Trigonometry

## Introduction

Trigonometry is an important branch of mathematics.

Trigonometry is a Greek word. The word Trigonometry has been divided into three phases.

## 3 MERTON mean MEASUREMENT

it is clear that Trigonometry means MEASUREMENT.

## What is angle.

Two rays have the same initial points make an angle with each other.

The starting point is called the initial point and the other is called the ending point or terminating point.

PROPERTY OF Triangle

The hypotenuse is always the longest side and it is the opposite of the right-angle.

The opposite side of the triangle that side is opposite to the angle.

The adjacent side is the side that is adjacent to the angle

you can check the Rotation of axes for further concepts.

## COMPLEX Number

complex number is a number that can be expressed in the form x+yi,

where x and y are real numbers, and i is a symbol called the imaginary part of complex no.

And satisfying the equation i2 = −1. Because no “real” number satisfies this equation,

In some way, it is the only “number” that we can square and get a negative value.

definition all the square roots in the following.

√−16=4i√−100=10i√−5=√5i√−28=√28i

## CIRCLE

The distance from the center we called the radius.

And the point is called the center. Two times the radius is known as the diameter.

## GROUP

Group theory,

The study of groups, which are systems consisting of a set of elements and binary operations.

That can be applied to two elements of the set which together satisfy.

These require that the be closed under the operation that it obeys the associative law

That it contains an identity element zero or 1

. If the group also satisfies the commutative law it is called a commutative, or abelian, group.

in the group, the identity element is 0

and all the properties satisfied are called the group and if commutative property satisfied is called an abelian group.

## MATRICES

A matrix is a rectangular array of numbers symbols and expressions that are arranged in

rows and columns. element: is called matrices.

SOME IMPORTANT MATRICES

row vector: A matrix with a single row

column vector: A matrix with a single column

square matrix: A matrix that has an equal number of rows and columns is called a square matrix.

matrix: A rectangular array of numbers, symbols, expressions, arranged in rows and columns

## VECTOR

definition of a vector. Vectors that have the same magnitude as well as direction.

This means that if we take a vector and translate it to a new position

a vector we obtain at the end of this process is the same vector we had in the beginning.