1/(1-x) +1/(1+x) +1/(1+x的平方)(分式的加减)
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1/(1-x) +1/(1+x) +1/(1+x的平方)(分式的加减)
1/(1-x) +1/(1+x) +1/(1+x的平方)(分式的加减)
1/(1-x) +1/(1+x) +1/(1+x的平方)(分式的加减)
1/(1-x) +1/(1+x) +1/(1+x的平方)
=(1+x)/(1-x)(1+x)+(1-x)/(1-x)(1+x)+1/(1+x^2)
=(1+x+1-x)/(1-x^2)+1/(1+x^2)
=2/(1-x^2)+1/(1+x^2)
=[2(1+x^2)+(1-x^2)]/(1-x^2)(1+x^2)
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