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  1. Why is the determinant of the matrix \( \begin{pmatrix} a_1 & b_1 \\ a_2 & b_2 \end{pmatrix} \) equal to \( a_1 b_2 - a_2 b_1 \)?

    I have found a geometrical interpretation (functor.network/user/414/entry) and with it also started a blog.

    #WordsAndSomeFormulas #Mathematics #MathEdu #Determinant #Geometry