||'''Book'''|| Linear Algebra ||
 ||'''Author'''|| Gilbert Strang ||
 ||'''Edition'''||  ||

/* code_begins */

{{{

A = matrix([[0,9,-12],[-9,0,20],[12,-20,0]])
print A
print "Is symmetric?", A.is_symmetric() 
print "Is skew_symmetric?", A.is_skew_symmetric() 
}}}

/* code_ends */

 * '''Solution by''': 
   * phanindra,student,nmrec