# FunctionRange

FunctionRange[f,x,y]

finds the range of the real function f of the variable x returning the result in terms of y.

FunctionRange[f,x,y,dom]

considers f to be a function with arguments and values in the domain dom.

FunctionRange[funs,xvars,yvars,dom]

finds the range of the mapping funs of the variables xvars returning the result in terms of yvars.

FunctionRange[{funs,cons},xvars,yvars,dom]

finds the range of the mapping funs with the values of xvars restricted by constraints cons.

# Details and Options

• funs should be a list of functions of variables xvars.
• funs and yvars must be lists of equal lengths.
• Possible values for dom are Reals and Complexes. The default is Reals.
• If dom is Reals then all variables, parameters, constants, and function values are restricted to be real.
• cons can contain equations, inequalities, or logical combinations of these.
• The following options can be given:
•  GeneratedParameters C how to name parameters that are generated Method Automatic what method should be used WorkingPrecision Automatic precision to be used in computations
• With , FunctionRange may use numerical optimization to estimate the range.

# Examples

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## Basic Examples(2)

Find the range of a real function:

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The range of a complex function:

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