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If A=[[x, x] , [x, x]] and B=[[x, -x] , ...

If `A=[[x, x] , [x, x]]` and `B=[[x, -x] , [-x, x]]` then prove that `x e^A=1/2(A.e^(2x)+B)` where `e^A= I+A+A^2/(2!)+...`

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