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Under what conditions is the matrix equation `A^2-B^2=(A-B)(A+B)` is true?

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RD SHARMA ENGLISH-ALGEBRA OF MATRICES-All Questions
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  3. Under what conditions is the matrix equation A^2-B^2=(A-B)(A+B) is ...

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  7. If A B=A and B A=B , then show that A^2=A , B^2=B .

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  19. Let A ,\ B be two matrices such that they commute. Show that for an...

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