# 20.5 Solving Trigonometric Equations

**Solve for Trig Function - Then Angle • Use Algebraic Methods and Trigonometric Identities • Use of Calculator**

One of the most important uses of the trigonometric identities is in the solution of equations involving trigonometric functions. The solution of this type of equation consists of the angles that satisfy the equation. When solving for the angle, we generally first solve for a value of a function of the angle and then find the angle from this value of the function.

When equations are written in terms of more than one function, the identities provide a way of changing many of them to equations or factors involving only one function of the same angle. Thus, *the solution is found by using algebraic ...*

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