• InverseFunction[f] represents the inverse of the function f, defined so that InverseFunction[f][y] gives the value of x for which f[x] is equal to y.
• For a function with several arguments, InverseFunction[f, n, tot] represents the inverse with respect to the n argument when there are tot arguments in all.
• As discussed in Section 3.2.7, many mathematical functions do not have unique inverses. In such cases, InverseFunction[f] can represent only one of the possible inverses for f.
• Example: InverseFunction[Sin]
• New in Version 2.