F-BF.B.4. Find inverse functions.
F-BF.B.4.a. Solve an equation of the form $f(x) = c$ for a simple function $f$ that has an inverse and write an expression for the inverse. For example, $f(x) =2 x^3$ or $f(x) = (x+1)/(x-1)$ for $x \neq 1$.
F-BF.B.4.b. Verify by composition that one function is the inverse of another.
F-BF.B.4.c. Read values of an inverse function from a graph or a table, given that the function has an inverse.
F-BF.B.4.d. Produce an invertible function from a non-invertible function by restricting the domain.
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