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

/* code_begins */

{{{
a=var('a')
b=var('b')
c=var('c')
d=var('d')
A=matrix([[a,a,a,a],[b,b,b,b],[c,c,c,c],[d,d,d,d]])
print det(A)
I=matrix([[1,0,0,0],[0,1,0,0],[0,0,1,0],[0,0,0,1]])
print det(I+A)
}}}

/* code_ends */

 * '''Solution by''': 
  * Swethakumari G, student,SNIST
  * Radha Bhukya, student, SNIST
  * Usha Rani,student, SNIST