а) f(g(t)) = (t/(t^2+1))^2 / (t/(t^2+1)) - 1 = t^2 / (t^2+1)^2 / (t/(t^2+1)) - 1 = t^2 / (t^2+1)^2 * ((t^2+1)/t) - 1 = t^2 / t(t^2+1) - 1 = t / (t^2+1) - 1
Ответ: t / (t^2+1) - 1
б) g(f(x)) = (x^2 / x - 1) / (x^2 / x - 1)^2 + 1 = (x^2 / x - 1) / ((x^2 / x - 1)^2 + 1) = (x^2 - x) / ((x^2 - x)^2 + 1)
Ответ: (x^2 - x) / ((x^2 - x)^2 + 1)
а) f(g(t)) = (t/(t^2+1))^2 / (t/(t^2+1)) - 1
= t^2 / (t^2+1)^2 / (t/(t^2+1)) - 1
= t^2 / (t^2+1)^2 * ((t^2+1)/t) - 1
= t^2 / t(t^2+1) - 1
= t / (t^2+1) - 1
Ответ: t / (t^2+1) - 1
б) g(f(x)) = (x^2 / x - 1) / (x^2 / x - 1)^2 + 1
= (x^2 / x - 1) / ((x^2 / x - 1)^2 + 1)
= (x^2 - x) / ((x^2 - x)^2 + 1)
Ответ: (x^2 - x) / ((x^2 - x)^2 + 1)