QUESTION : If AB=A and BA=B then show that A2=A and B2 =B
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If AB=B then A is 1
If BA=B then B is also 1
So A^2=1^2=1=A
and, B^2=1^2=1=B
If BA=B then B is also 1
So A^2=1^2=1=A
and, B^2=1^2=1=B
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