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Consider the following in respect of mat...

Consider the following in respect of matrices A and B of same order :
1. `A^(2)-B^(2)=(A+B)(A-B)`
2. `(A-I)(I+A)=0 harr A^(2)=I`
Where I is the identity matrix and O is the null matrix.
Which of the above is/are correct ?

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