Question

can any send me solution plz​

Answer 1

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f(x)=x/x-1

f(x/y)=(x/y)/(x/y)-1

f(x/y)=x/x-y

f(y/x)=y/y-x

f(x/y)/f(y/x)

=x/x-y×y-x/y

=-x/y