Mathematics
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    4-3*(100-87.2)^2/1600
    arccos0.456
    2arctan(4/10000)
    2*arctan(4/10000)
    2*arctan(0.0004/100)
    2*arctan(0.0004/100)
    2arctan(0.0004/100)
    2arctan0.000004
    2arctan0.0004
    2*arctan(4/10000)
    2arctan0.004
    arctan(-7.33)
    arctan(-7.33)
    2arctan(4/10000)
    arctan(-7.33)
    arctan(0.04/100)
    arctan(4/100)
    arctan(0.04/100)
    arctan(8π÷10)
    (755*2.2+1200)/(1.3/1.36-1.3*0.5)*25

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