if A is a square matrix such that A2= I what is the inverse of A? ans fast needed its urgent plsssss

A is a square matrix such that A2 = I. 

⇒ A2 A–1= I A–1  (post multiplying by A–1 on both the sides)

⇒ A (A A–1) = A–1

⇒ A I = A–1

⇒ A = A–1

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inverse of A is A......

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