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