# CouenneExprUnary.hpp File Reference

`#include <iostream>`
`#include "CouenneExpression.hpp"`
`#include "CouenneTypes.hpp"`

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## Classes
class | Couenne::exprUnary
| expression class for unary functions (sin, log, etc. More...
## Namespaces
namespace | Couenne

| general include file for different compilers
## Functions
CouNumber | Couenne::zero_fun (CouNumber x)
| zero function (used by default by exprUnary)

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