\"\"

\

The general form of hyperbola is \"\", where \"\".

\

The eccentricity of hyperbola is \"\".

\

Substitute \"\" in \"\".

\

\"\"

\

\"\"

\

\"\"

\

\"\"

\

\"\".

\

Therefore, the eccentricity of equilateral hyperbola is \"\".

\

\"\"

\

The eccentricity of equilateral hyperbola is \"\".