arctan(2.3/1.6)
    arctan(3.9/(-2.2))
    arctan(2.9/3.6)
    arctan(-3/2.4)
    arctan((-7.5*3^(1/2)-8)/-7.5)
    arctan((7.5*3^(1/2)-8)/7.5)
    arctan(-2.5/7.7)
    arctan(2.95/6.8)
    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

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