回复：Yes. Do you have a fast and easy way to explain it?
jinjing
2009-12-30 18:42:54
( reads)
x c-63-t -x+t+63
c-t-47 t 47
x+t-63 63 -x+c-t
The sum of first column : x+c-t-47+x+t-63=c we get x=55.
If we know linear algebra well, We can let t=c=0 and get a rotational matrix: 55 -63 8
-47 0 47
-8 63 -55
Good luck. Happy new Year.