If the square of the matrix [[a,b],[a,-a...

If the square of the matrix `[[a,b],[a,-a]]` is the unit matrix, then b is equal to a)`(a)/(1+a^(2))` b)`(1-a^(2))/(a)`c)`(1+a^(2))/(a)`d)`(a)/(1-a^(2))`

A

`(a)/(1+a^(2))`

B

`(1-a^(2))/(a)`

C

`(1+a^(2))/(a)`

D

`(a)/(1-a^(2))`

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The correct Answer is:

B

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