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If A=[{:(0," "c,-b),(-c," "0," "a),(b,-a...

If `A=[{:(0," "c,-b),(-c," "0," "a),(b,-a," "0):}]" and "B=[{:(a^(2),ab,ac),(ab,b^(2),bc),(ac,bc,c^(2)):}]`, show that AB is a zero matrix.

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