## Math Problem Statement

Which represents an even function?

*y* = cos(*x*)

*y* = sin(*x*)

*y* = tan(*x*)

*y* = cot(*x*)

## Solution

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## Math Problem Analysis

### Mathematical Concepts

Even and Odd Functions

Trigonometric Functions

### Formulas

f(x) = f(-x) for even functions

cos(-x) = cos(x)

sin(-x) = -sin(x)

tan(-x) = -tan(x)

cot(-x) = -cot(x)

### Theorems

Even and Odd Function Theorem

### Suitable Grade Level

Grades 9-11

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