Even-odd identities are mathematical properties of trigonometric functions that define how these functions behave when their inputs are negated. Specifically, even functions have the property that $f(-x) = f(x)$, while odd functions satisfy $f(-x) = -f(x)$. Understanding these identities is crucial as they help simplify expressions and solve equations involving trigonometric functions.
congrats on reading the definition of even-odd identities. now let's actually learn it.