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InverseFunctions

InverseFunctions
is an option for Solve and related functions which specifies whether inverse functions should be used.

MORE INFORMATION

Settings for InverseFunctions are:

	True	always use inverse functions
	Automatic	use inverse functions, printing a warning message (default)
	False	never use inverse functions

Inverse functions provide a way to get some, but not in general all, solutions to equations that involve functions which are more complicated than polynomials.

Solve[Sin[x]a, x, InverseFunctions->True]{{x→ArcSin[a]}} gives a single solution in terms of ArcSin. In fact, there is an infinite number of solutions to the equation, differing by arbitrary multiples of 2. Solve gives only one of these solutions.

When there are several simultaneous equations to be solved in terms of inverse functions, Solve may fail to find any solutions, even when one exists.

When inverse functions are allowed, Solve solves for f[expr] first, then applies InverseFunction[f] to the result, equates it to expr, and continues trying to solve for the remainder of the variables.

Basic Examples (3)

By default, Solve uses inverse functions but prints warning messages:

With InverseFunctions->True, Solve does not print inverse function warning messages:

With InverseFunctions->False, Solve does not use inverse functions:

Solving algebraic equations does not require using inverse functions:

FindRoot

Equations in One Variable

New in 2

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