Identify if the given functions are relations: Tangent function

 Identify if the given functions are relations: Absolute Value function

Identify if the given functions are relations: Constant function

Identify if the given functions are relations: Rational function

Identify if the given functions are relations: Cubic function

Identify if the given functions are relations: Cosine function

Identify if the given functions are relations: Polynomial function

Identify if the given functions are relations: Parabolic function

Identify if the given functions are relations: Sine function

Identify if the given functions are relations: Quadratic function