DUMB QUESTIONQ1. If co-ordinates (x, y)one rotated by are augle
about the arigin the new coordinetes are represnted by matrix . How ?
Sol
n :-
Illustration :-
Q1. A =
and B 2
show that A B
B A .
Soln :- A . B =
=
B . A =
=
Q 2. Show taht A =
is ...of index 3.
Solution :- A
2 =
A
3 = A
2 - A =
=
A
3 = 0 i.e. A
k = 0
DETERMINAATS :-
The experssion
is colled a determinant.
Calculation of determinants = a
1 b
2 - a
2 b
1
= a
1 (b
2 c
3 - b
2 b
3) - b
1 (a
2 c
3 - c
2 a
3) + c
1 (a
2 b
3 - b
2 c
3)