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education/math/MATH1060 (trig)/Graphing.md

@@ -108,7 +108,10 @@ $A$, $B$, $C$, and $D$ will have similar meanings to the cosecant function as th
 - The vertical asymptotes of cosecant occur at $x = \frac{C}{B} + \frac{\pi}{|B|}k$, where $k$ is an integer.
 - The vertical shift is $D$. 
 # Inverse Functions
+For any one to one function $f(x) = y$, a function $f^{-1}(y) = x)$. A function is considered one-to-one if every input only has one output, and every output can only be created from a single input. 
 
+- The *domain* of $f$ is the *range* of $f^{-1}$. 
+- The *range* of $f$ is the *domain* of $f^{-1}$. 
 # Examples
 > Given $-2\tan(\pi*x + \pi) - 1$