Mathematics
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    arctan(tan(2π))-arctan(tan(0))
    arctan(3*tan(2π))-arctan(3*tan(0))
    arctan(3*tan(2π))
    arctan(3*tan(360))
    arctan(3*tan(0))
    (3/10+3/8)*-13/3-11/3
    -3*-3-3
    405*2.54^((28-25)/10)=
    31*870+13*310
    7000+100-421.33
    =60%
    =60%
    =60%
    (18*0.6*2000+15*0.6*1500+12*0.6*1000)/(18*2000+15*1500+12*1000)
    (18*0.6*2000+15*0.6*1500+12*0.6*1000)/(18*2000+15*15000+12*1000)
    (18*0.6*2000+15*0.6*1500+12*0.6*1000)/18*2000+15*15000+12*1000
    5000/(12*200+10*500+9*600)
    (12-9)*200+(10-6)*500+4*600
    3*5
    -5-7

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