2+3＝
    arctan0.824
    arctan0.7724
    arctan0.786773
    90000000000-1
    arcsin0.5=
    arctan(sqrt(3))
    -5000 *(√75)^2/[((√75)^3-75*(√75）)^2+(20*(√75)^2)^2]
    -5000 *√75^2/[(√75^3-75*√75)^2+(20*√75^2)^2]
    1/2+1/2÷1/2+1/2
    ln(11250.06/11208.08)*365
    0.527+ln(0.527)
    0.215*36*14.4/4000
    1.6*9
    53/44.42
    1/(1/10+1/20+1/29)
    2.5^2*3.14*82
    2.5^2*3.14
    2.5^2
    1/(2*3.14*(81*5.9)^(1/2))

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