arctan(1.5*sqrt(3)/(2.5))
    arctan(1.5*sqrt(3)/(-1.5))
    －√3/3（－√7+√3+1）（－√7+√3+1）－2√3/3（√3－√7+1）+3
    0.0089×4.51×3^2+0.0174×1.875×3^2=
    39*18
    0.0409×4.51×3^2+0.0965×1.875×3^2=
    0.0965×4.51×3^2+0.0174×1.875×3^2=
    0.0409×4.51×3^2+0.0089×1.875×3^2=
    8.96*18
    -0.07856×9.02×3.6^2=
    -0.1163×9.02×3.6^2=
    0.05492×4.51×3.6^2+0.0936×1.875×3.6^2=
    0.01422×4.51×3.6^2+0.0188×1.875×3.6^2=
    0.0936×4.51×3.6^2+0.0188×1.875×3.6^2=
    0.05492×4.51×3.6^2+0.01422×1.875×3.6^2=
    0.0153×4.135×3.6^2+0.0210×1.5×3.6^2=
    0.0530×4.135×3.6^2+0.0892×1.5×3.6^2=
    0.0892×4.135×3.6^2+0.0210×1.5×3.6^2=
    0.0530×4.135×3.6^2+0.0153×1.5×3.6^2=
    1+15/4×1+1+15/4×2

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