Mathematics
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    65/(1.7)²
    sqrt(21)
    125/27-5×25/9+10
    sin20
    360*308(390-35)
    1.0*14.3*200(390-100)
    -3--7
    -3--11
    6+-11
    13+-5
    -6+-11
    20*lg(0.508)
    13.05*sqrt(1+(13.05/10)^2)*sqrt(1+(13.05/20)^2)*sqrt(1+13.05^2)
    100*sqrt(1+(13.05/2)^2)
    58/7
    sqrt58
    16^2.5
    √(1.5^2+3.5^2)
    5.49*4.5+4.5*3.51*4.5
    90-arctan(12.6/2)-arctan(12.6/5)-arctan(12.6/10)

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