(x^2+1)/√(x^2+1)=,

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(x^2+1)/√(x^2+1)=,
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(x^2+1)/√(x^2+1)=,
(x^2+1)/√(x^2+1)=,

(x^2+1)/√(x^2+1)=,
解(x^2+1)/√(x^2+1)
=[√(x^2+1)]^2/√(x^2+1)
=√(x^2+1)

(x^2+1)/√(x^2+1)=√(x^2+1)

(x^2+1)/(x+1)
=(x+1)分之(x^2+1)

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