Sub Topics

Trigonometry is a separate branch of mathematics, which deals with triangles. It also studies the relationship between their sides and angles, by defining the separate trigonometric functions. The trigonometric functions are universally adopted in the part of pure mathematics and applied mathematics. The introduction to trigonometry is quite simpler. The basis of its function depends upon right angled triangle. Hence, to make a complete angle, two acute angles are added to the 90^{0}. These are known as complementary angles. If the length of the one side is given, then we can easily determine the other two sides of the triangle. Now, we will see what is trigonometry.

The history of trigonometry starts from a very earlier period of the second century of BCE during which the topic of the trigonometry was first introduced by the great mathematician of Greece whose name was Hipparchus. The history of trigonometry and the history of the trigonometric functions have followed the common lines of the history of the math.
Now, let us start with triangles. The first discussion about triangles in the history of trigonometry was held in the math of the Egypt during the period of the second millennium of BC and was also found in the math of the Babylon. However, the discovery of the trigonometric functions and their proper study was started from the Hellenistic math which was introduced in India as a section of the astronomy. The development of the history of trigonometry in India with the help of introduction and the proper study of the trigonometric functions was done in the period of the Guptas and was mostly credited to the great Indian mathematician Aryabhata, who developed the math in India to a great level in the sixth century and in the history of trigonometry. During the period of the middle ages, the development of the trigonometry was further carried by the math of the Islam.