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# Trigonometry

## Sum and differences identities

These sum and differences identities are very useful whenever expressions involving trigonometric functions need to be simplified.

## Product to sum identities

These product to sum identities are very useful whenever expressions involving trigonometric functions need to be simplified.

## Sum to product identities

These sum to product identities are very useful whenever expressions involving trigonometric functions need to be simplified.

## Half angle identities

These half angle identities are very useful whenever expressions involving trigonometric functions need to be simplified.

## Double angle identities

These double angle identities are very useful whenever expressions involving trigonometric functions need to be simplified.

## Pythagorean identities

These Pythagorean identities are very useful whenever expressions involving trigonometric functions need to be simplified.

## Quotient identities

These quotient identities are very useful whenever expressions involving trigonometric functions need to be simplified.

## Reduction formulas

The trigonometric reduction formulas help us to reduce big angles in common sines, cosines, tangents and cotangents functions.

Table of trigonometric functions (sine, cosine, tangent, cotangent) exact values. The range of degrees is $[0°,90°]$