arctan90
    1/2+1/3+3/5+6/7+7/12+9/20+11/30+13/42
    25/15
    (2*(1/4))^-(1/2)
    2*(1/4)
    tan(2*0.377483+π/4)
    tan(2*0.377483+π/4)=
    lg56+ln3
    3sin（1/3）
    arccos(7/9)
    (14/5)/[√(14/5)]
    [(-1-1)^2+(-1-1)^2+(2-1)^2+(2-1)^2+(3-1)^2]/5
    2lg5-1+3^log(3,7)+lg4
    sqrt-9
    arccos（0.78）
    (50+50)*0.88/1.52+35*0.88/1.77+25/1.92+25/1.92
    131.9*3
    3415.5*3
    √210
    e^(-1)*(-1-1)-(-1)+1

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