Set every denominator equal to zero and exclude those values
For even roots, set the radicand greater than or equal to zero
For logarithms, set the argument greater than zero
For inverse trigonometric functions, apply their required input restrictions
For rational expressions, exclude any values that make the denominator zero
For square roots in denominators, require the radicand to be greater than zero
For composite functions, combine all restrictions from each part
Solve the resulting inequalities or equations
Write the domain using interval notation or set notation