# Advanced Trigonometric Equations and Radians

This page delves deeper into solving more complex trigonometric equations and introduces the concept of solving equations in radians. It builds upon the foundational knowledge from the previous page to tackle more challenging problems.

The page starts with examples of solving equations involving multiple trigonometric functions, such as cos x = -√2/2. It demonstrates how to find solutions in different quadrants and how to express answers in degrees.

**Example**: For cos x = -√2/2, the solutions are x = 135° and x = 225° in the range 0° ≤ x ≤ 360°.

The document then transitions to **solving trigonometric equations in radians**, which is crucial for more advanced mathematics and physics applications. It provides examples of how to convert between degrees and radians and how to solve equations given in radian measure.

**Highlight**: When solving trigonometric equations in radians, it's important to remember that 2π radians equals 360°.

The page also covers more complex equations that require algebraic manipulation before applying trigonometric techniques. For instance, it demonstrates **how to solve trigonometric equations with sin and cos** in the same equation.

**Example**: For the equation 3 sin x + cos x = 0, the solution involves dividing by cos x and using the identity tan x = sin x / cos x to simplify the equation.

Finally, the document touches on the **domain and range of trigonometric functions**, emphasizing how these concepts are crucial for correctly solving and interpreting trigonometric equations.

**Vocabulary**: Range - The set of all possible output values (usually y) for a given function.

This page provides students with a comprehensive understanding of **how to solve Trigonometry step by step**, equipping them with the skills needed to tackle a wide range of trigonometric problems, both in degrees and radians.