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[" If "f(x)=(x-1)/(x+1)," prove that "],...

[" If "f(x)=(x-1)/(x+1)," prove that "],[f(x)-f(y)=(x-y)/(1+xy)],[(f(x)*f(y))/(1+f(x)*f(y))=(x-y)/(1+xy)]

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If f(x) = (x-1)/(x+1) , then prove that (f(x)-f(y))/(1+f(x)f(y))=(x-y)/(1+xy) .

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