Trig equations

There are three types of trig equations: sum and difference, half angles, and double angles. For each the sin, cos, and tan equations differ from one another. When using a sum and difference equation, the question will provide a ratio or degrees of sin, cos and tan. You want to split the given degree into workable part so that if you are given sin90, the. You would break it up into the angles of the special triangles to make sin(45+45). Same for the difference.

Otherwise, the equations are plug and chug and you just need to be able to identify which equation to use when.