range=(a!=-4&a>2),(b>4)
var('a')
b=matrix([[a,2,2],[2,a,2],[2,2,a]])
print b
b.det()
solve(b.det(),a)
var('b')
d=matrix([[1,2,4],[2,b,8],[4,8,7]])
print d
d.det()
solve(d.det(),b)

Strang-6.2-2-U (last edited 2010-12-18 07:30:28 by sarada)