## Trigonometry - applying addition/subtraction formulas

This lesson demonstrates examples of how to find the exact value of trig expressions by applying our knowledge of special right triangle relationships and.

## Sum and difference trigonometric identities

Using the sum and difference identities, i do examples of evaluating trigonometric expressions that require the use of the sum and difference identities for sine,.

7.2.1 - addition and subtraction formulas

Introduction and derivation of the addition and subtraction formulas for sine, cosine and tangent.

**Precalculus trigonometry: trig identities (9 of 57) addition and subtraction formulas**

Visit for more math and science lectures! In this video i will introduce trigonometric addition and subtraction formulas.

**Basic excel formulas - add, subtract, divide, multiply**

Create a basic formula to add columns, subtract, divide, and multiply. This is a simple tutorial showing how to calculate simple formulas.

**Trigonometry addition and subtraction formulas for tan tangent**

Trigonometry made easy. This video shows easy ways to use the addition formula it will make other parts of trig easier.

### Adding & subtracting vertical columns in excel: ms excel tips

Subscribe now watch more: adding and subtracting.

**Analytic trigonometry addition and subtraction formulas**

## Addition and subtraction formula for tangent e1

7.2.1.2 addition and subtraction formulas