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Question 4.
Find the inverse of the matrix
⎛
⎝
111
320
001
⎞
⎠
.
Question 5.
Let
A
be the matrix of orthogonal projection to the line
y
=3
x
in
R
2
,andlet
B
be the matrix
of orthogonal projection to the line
y
=
−
1
3
x
. (The two lines are perpendicular.) Find
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 Fall '08
 lee

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