Mathematics
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    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
    sqrt(729)
    6.912-0.00187*2998.303
    7.336-0.0098*3063.908
    ((11-3*(1/5)/2)

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