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If $A = [\begin{array}{cc} a b & b^{2} \\ - a^{2} & - a b \end{array}]$ , then A² is equal

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Correct option is A

A2=abb2−a2−ababb2−a2−ab=a2b2−a2b2ab3−ab3−a3b+a3b−a2b2+a2b2=O

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If A=abb2−a2−ab , then A2 is equal

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If $A = [\begin{array}{cc} a b & b^{2} \\ - a^{2} & - a b \end{array}]$ , then A² is equal