um sum and difference identities by marc

SUM AND DIFFERENCE IDENTITIES
This is Marc Valino.
Sum and Difference identities is used to show how to find sine, cosine, or tangent of the sum or difference of two given angles.

You can use these 3 formulas to find out the sum identity of sin, cos, and tan of two given angles.

These 3 are used to find the difference identity of sin, cos, and tan of two given angles.

Example:

To determine exact trigonometric values for angles it is the same concept as above but there is one extra step.

Example:

THE END.