# Sum and difference identities

##### Examples

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###### Topic Notes

Trig identities are formulas developed based on Pythagorean Theorem. These identities show us how and where to find the sine, cosine, and tangent of the sum and difference of two given angles.

Download the Trigonometry identities chart here

Formulas:

$\sin (A + B)$

$\sin (A - B)$

$\cos (A + B)$

$\cos (A - B)$

$\tan (A + B)$

$\tan (A - B)$

Formulas:

$\sin (A + B)$

$\sin (A - B)$

$\cos (A + B)$

$\cos (A - B)$

$\tan (A + B)$

$\tan (A - B)$

###### Basic Concepts

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