Mathematics
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    23/6^5+0.123456789
    3.14159265+1/1/1/1/2^2
    1/2+5/9+9/5+0.33
    arctan(20/7.5)-arctan(20/0.75)-arctan(20/100)=
    arctan(20/7.5)-arctan(20/7.5)-arctan(20/100)=
    arctan(20/7.5)-arctan(2/7.5)-arctan(2/100)=
    arctan20
    90-arctan(0.25*2.9)-arctan(0.06*4.9)=
    arctan(3.725490)
    arctan(0.531914)
    arctan(0.4166666)
    arctan(0.416666)
    arctan[(2*0.591)/(sqrt(sqrt(1+4(0.591)^4)-2(0.591)^2))]
    arctan[(2*0.0.591)/(sqrt(sqrt(1+4(0.591)^4)-2(0.591)^2))]
    arctan[(2*0.358)/(sqrt(sqrt(1+4(0.358)^4)-2(0.358)^2))]
    arctan[(2*0.358)/(sqrt(sqrt(1+4*(0.358)^4))-2*(0.358)^2)]
    1/8000×(1/8000+1/100)
    800*14%
    500*13%+2000*9%+600*6%+10500*0.09
    500*13%+2000*9%+600*6%

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