*Make sure it is set to the proper mode, either degrees or radians, depending on the criteria of the given problem. In quadrant III, the reference angle is Solving a quadratic equation may be more complicated, but once again, we can use algebra as we would for any quadratic equation. Is there more than one trigonometric function in the equation, or is there only one? If there is only one function represented and one of the terms is squared, think about the standard form of a quadratic.*

When we want to calculate the function for an angle larger than a full rotation of 360° (2 We can also find missing side lengths.

The general rule is: When we know any 3 of the sides or angles we can find the other 3 (except for the three angles case) See Solving Triangles for more details.

Trigonometry helps us find angles and distances, and is used a lot in science, engineering, video games, and more!

The triangle of most interest is the right-angled triangle.

We need to make several considerations when the equation involves trigonometric functions other than sine and cosine.

Problems involving the reciprocals of the primary trigonometric functions need to be viewed from an algebraic perspective.However, with trigonometric equations, we also have the advantage of using the identities we developed in the previous sections.When we are given equations that involve only one of the six trigonometric functions, their solutions involve using algebraic techniques and the unit circle (see [link]).Notice that trigonometric equations that are in quadratic form can yield up to four solutions instead of the expected two that are found with quadratic equations.In this example, each solution (angle) corresponding to a positive sine value will yield two angles that would result in that value.We read the equation from left to right, horizontally, like a sentence.We look for known patterns, factor, find common denominators, and substitute certain expressions with a variable to make solving a more straightforward process.The right angle is shown by the little box in the corner: Another angle is often labeled Why is this triangle so important?Imagine we can measure along and up but want to know the direct distance and angle: Trigonometry can find that missing angle and distance. = Play with this for a while (move the mouse around) and get familiar with values of sine, cosine and tangent for different angles, such as 0°, 30°, 45°, 60° and 90°. It is a circle with a radius of 1 with its center at 0.Trigonometric equations are, as the name implies, equations that involve trigonometric functions.Similar in many ways to solving polynomial equations or rational equations, only specific values of the variable will be solutions, if there are solutions at all.

## Comments Trigonometry Solved Problems Trigonometric Equations

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