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Is the solution correct?
for case 4
|(a+b)/(a-b)|^(ab)
=|(a-b)/(a+b)|^(-ab)
=|-[(-a)+b]/(a+b)|^(-ab)
=|[(-a)+b]/(a+b)|^(-ab)
>1
or,|(a+b)/(a-b)|^(ab)>1
.
Is the solution correct?
.