# Basic Trigonometric Formulae

## Trigonometric transformation formulas

Trigonometric Transformation Formulas: The set of formulas which are useful in transforming sums and difference of trigonometric functions into their products and vice versa. These sets of formulas are derived directly from Trigonometric Addition and Subtraction formulas. Here we will derive the transformation formulas using following four formulas which are Trigonometric addition and subtraction formulas: If we add and subtract the first two and last two equations in the equations above then we can get the following equations:   Now...

## Trigonometric multiple and sub-multiple angle formulas

Trigonometric multiple and sub-multiple angle formulas: Prerequisite: Please consider studying following topics before you study this article for better grasp and understanding: Trigonometric addition and subtraction formulas Trigonometric Functions Pythagorian Identities   In this tutorial we shall derive formula for trigonometric functions of multiple and sub-multiple angle  , For example:   etc. Trigonometric multiple angle formulas: Under the trigonometric multiple angle formulas we shall derive the formulas for double and triple...