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If A=[[4,2,-3],[1,3,-6],[-5,0,-7]] then ...

If A=`[[4,2,-3],[1,3,-6],[-5,0,-7]]` then `1/2[A+A^T]` is
(a)`[[4,3/2,-4],[3/2,3,-3],[-4,-3,-7]]`
(b) `[[0,1/2,1],[-1/2,0,-3],[-1,3,0]]`
(c) `[[4,3,-4],[3,3,-3],[-4,-3,-7]]`
(d) `[[0,1,1],[-1,0,-3],[-1,3,0]]`

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