If the square of the matrix (\table a,b;a,-b) is the unit matrix, then b is equal to

KEAM 2016 Math Paper

Question : 30 of 120

Marks: +1, -0

If the square of the matrix (

a	b
a	−b

) is the unit matrix, then b is equal to

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a2+ab	ab−ab
a2−a2	ab+a2

a	b
a	−a

a	b
a	−a

a	b
a	−a