## Even Function Properties

### An even function is a mathematical function that exhibits symmetry with respect to the y-axis

An even function is a mathematical function that exhibits symmetry with respect to the y-axis. In other words, if you were to fold the graph of an even function along the y-axis, the two halves would perfectly overlap. This symmetry is characterized by a number of properties:

1. Even functions are symmetrical about the y-axis: This means that if (x, y) is a point on the graph of an even function, then (-x, y) is also a point on the graph.

2. Even functions have even exponents: Even functions are often expressed as polynomials, and in these cases, the exponents of all terms in the polynomial are even. For example, f(x) = x^2 is an even function, whereas f(x) = x^3 is not.

3. Even functions have a reflective property: If an even function is reflected over the y-axis, it remains unchanged. This can be represented as f(-x) = f(x) for all x in the domain of the function.

4. The y-axis is an axis of symmetry: The y-axis serves as a line of reflection symmetry for even functions. This means that if a point lies on the graph of an even function, its reflection across the y-axis also lies on the graph.

5. Even functions have special properties with respect to integration: When integrating an even function over a symmetric interval (e.g., from -a to a), the integral evaluates to twice the integral over the positive half. Mathematically, this property is expressed as ∫[-a,a] f(x) dx = 2∫[0,a] f(x) dx.

Examples of even functions include f(x) = x^2, f(x) = |x|, f(x) = cos(x), and f(x) = cosh(x), among others.

Understanding the properties of even functions is essential in various branches of mathematics, including calculus, linear algebra, and differential equations, as it allows for simplifications and facilitates problem-solving.

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