Question
Find the matrix of co-factors for the matrix $\left[\begin{array}{cc}1 & 3 \\ 4 & -1\end{array}\right]$
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Show that lines represented by $x^2+6 x y+g y^2=0$ are coincident.
Question is modified.Show that lines represented by $x^2+6 x y+9 y^2=0$ are coincident.
$\int_0^{\pi / 4} \sqrt{1+\sin 2 x} \cdot d x$