verify verify(×÷y)^-1 = x^-1 ÷ x^-1 for x = - 5/11 and - 3/5
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(x/y)^-1=x^-1÷y^-1
(-5/11÷-3/5)^-1=(-5/11)^-1÷(-3/5)^-1
(25/33)^-1=11/-5*-3/5
33/25=33/25
Hence proved
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