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Question

Show that: ∣ ∣12i13ii3213i∣ ∣=7+18i, where i=1.

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Solution

Given,

12i13ii3213i

=1det(i323i)(2i)det(3i21i)1det(3ii313)

=1(7)(2i)51(8i)

=7+18i

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