Mathematics
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    arctan(-1/2)
    0.0736/1.0108+0.0736/(1.0108)^2+(0.0736+2.3)/(1.0108)^3=
    0.092/1.0186+0.092/(1.1086)^2+0.092+(1.1086)^3+0.092/(1.1086)^4+(0.092+2.3)/(1.1086)^5=
    5500*0.7*0.7
    arctan(-3/4)
    arctan(-4/3)
    65×65÷66
    14/9-1/6+2/9+5/6=
    260/(1-1/10-1/4)
    3:2
    (e3+1)/(e-3+1)
    400:2*30
    400^2*30
    6/11-1/2+5/11
    1/4+1/2+1/4
    1-1/3-1/3
    arcsin0.371644213
    arcsin0.3567
    (11-3*(1/5))/2
    1199773683/396500

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