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Problem
Problem
If
A
=
[
1
2
−
1
4
]
A = \begin{bmatrix} 1 & 2 \\ -1 & 4 \end{bmatrix}
A
=
[
1
−
1
2
4
]
and
θ
\theta
θ
be the angle between the two non-zero column vectors
X
X
X
such that
A
X
=
λ
X
AX = \lambda X
A
X
=
λ
X
for some scalar
λ
\lambda
λ
, then
9
sec
2
θ
9 \sec^2 \theta
9
sec
2
θ
is equal to a. 13 b. 12 c. 11 d. 10
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