||'''Book'''|| Advanced Engineering Mathematics ||
 ||'''Author'''|| Erwin Kreyszig ||
 ||'''Edition'''|| 8th Edition ||

/* code_begins */

{{{
A=matrix([[7,14,21],[36,18,6],[87,12,-45]])
A
A.det()
}}}

/* code_ends */

 * '''Solution by''': 
   * <monica>, <student> ,<snist>