Q. 55.0( 1 Vote )

If A = {x<span la

Answer :

Here,={XϵC:X2=1}


={1 ,-1}


B={xϵC:X4=1}


={1,-1,i,-i}


Now, AB=A(AB)


={1,-1}{1,-1}


=ϕ


And BA=B(AB)


={1,-1,i,-i}{1,-1}


={i,-i}


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