log(1.5,30)
    log(2,30)
    0.25*0.25*arcsin(0.1282/0.25)
    320*4.21^2*12/(4.21^2*(32-4.21^2)^2+144*4.21^4)
    ((-(11/12))-(3/4))*16+(-(7/3))/(-(7/2))
    180-90+arctan(1.5/0.1875)-arctan(1.5/0.028)-2arctan(1.5/12)
    (-1)+(1/12)+(3/2)/(1/4)
    10*1.2-1/2*10*1.2*1.2
    (3-3/5)/5/3
    2-1/(-2^2)
    sqrt(38)
    3√2/2+3√2/2
    1234+43211
    （tan90/0）
    cos90/3
    π2
    sin120
    0.0576/(2.475-1.475*0.0576)
    0.112/(2.475-1.475*0.112)
    0.1935/(2.475-1.475*0.1935)

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