# Sum Difference Identities Calculator

Posted by Dinesh onUse the simple trigonometry calculator to calculate sum difference identities of trigonometric identities online.

## Sum Difference Identities - Trigonometry Calculation

### Formula:

#### Sum Difference Identities Equations

sin(? + ?) = [sin(?) × cos(?)] + [cos(?) × sin(?)]cos(? + ?) = [cos(?) × cos(?)] - [sin(?) × sin(?)]

tan(? + ?) = [tan(?) + tan(?)] / [(1 - tan(?) × tan(?))]

sin(? - ?) = [sin(?) × cos(?)] - [cos(?) × sin(?)]

cos(? - ?) = [cos(?) × cos(?)] + [sin(?) × sin(?)]

tan(? - ?) = [tan(?) - tan(?)] / [(1 + tan(?) × tan(?))]