x(1-x^18)/(1-x)=34.49652367
    x(1-x^18)/(1-x)=37.41847157
    x(1-x^18)/(1-x)=118.7290301
    x(1-x^18)/(1-x)=81.35592326
    x(1-x^18)/(1-x)=135.2450416
    x(1-x^18)/(1-x)=98.57080314
    1-2x/（1+x²）²=0
    x(1-x^18)/(1-x)=74.88162322
    1-2x/（1+x²）²
    x(1-x^18)/(1-x)=116.067634
    x(1-x^18)/(1-x)=63.51477644
    x(1-x^18)/(1-x)=142.4737757
    e^arctanx=0
    x(1-x^18)/(1-x)=262.8737494
    x(1-x^18)/(1-x)=74.96248699
    x(1-x^18)/(1-x)=71.35308377
    x(1-x^18)/(1-x)=469.7508701
    x(1-x^18)/(1-x)=105.2091596
    x(1-x^18)/(1-x)=82.02921626
    x(1-x^18)/(1-x)=95.74067021

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