var('s')
a=matrix([[s,-4,-4],[-4,s,-4],[-4,-4,s]])
print a
a.det()
solve(a.det(),s)
var('t')
b=matrix([[t,3,0],[3,t,4],[0,4,t]])
print b
b.det()
solve (b.det(),t)

Strang-6.2-21-U (last edited 2010-12-18 09:23:07 by sarada)