设f(x)=(xx-1)/(xx+1)求f(b/a)
2个回答
f(x)=(x^2-1)/(x^2+1)
f(b/a)=(b^2/a^2 -1 )/(b^2/a^2 +1)
=(b^2-a^2)/(b^2+a^2)
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