If \( A=\left[\begin{array}{rr}1 & 2 \\ -1 & 4\end{array}\right] \)... VIDEO
If \( A=\left[\begin{array}{rr}1 & 2 \\ -1 & 4\end{array}\right] \) and \( \theta \) be the angle between the two non-zero column vectors \( X \) such that \( A X=\lambda X \) for some
\( \mathrm{P} \) scalar \( \lambda \), then \( 9 \sec ^{2} \theta \) is equal to
(a) 13
(b) 12
(c) 11
(d) 10
W.
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