Mathematics
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    π/4 (412^2-400^2 )×4911.5×7850
    (2^2+3^2)(4^2+5^2)(6^2+7^2)
    (1+2)(2+3)(3+4)
    (900×12×12×12)/12
    (900×12×12)/6
    2.5*(0.8/0.9)^0.5
     77×21+45-12+111×4523655
    77*21
    4523655*111
    (4/7)*(3/5)
    (4/7)/(3/5)
    (4:7)÷(3:5)
    (4÷7)÷(3÷5)
    (4/7)÷(3/5)
    sin1/cos1
    arctan-2/3
    1/2arctan(-4)
    1/2arctan(8)
    1/2arctan(8)
    30.6×0.69×0.5

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