Mathematics
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     220+600= 360+100= 200+600=
    600+90= 180-80= 260+400= 700+800= 240-60= 470-300= 500+900= 520-400= 180-100= 220+600= 360+100= 200+600=
    170-400= 780-200= 340-300= 120+600= 260+300= 400+600= 900-700= 780-80= 640-400=
    400+500= 200+400= 300+400= 800-500= 700-400= 700-300= 120+300= 400+200= 460+300=
    tan(arccos0.71)
    900-24
    527.63*(sin1+sin1.92)/3.14
    1683.83*(sin1)^3/3.14
    sqrt((-2.4-(-6.02))^2+3.2^2)
    sqrt((-2.4-(-2.66))^2+3.2^2)
    sqrt(0.4*0.4+3.2*3.2)
    sqrt(2.4*2.4+3.2*3.2)
    sqrt((6.02-2.4)^2+3.2^2)
    sqrt(2.4^2+3.2^2)/(cos(0.5*(53.13-44)))*(cos(0.5*(53.13+44)))
    sqrt(2.4^2+3.2^2)*(cos(0.5*(53.13-44)))/(cos(0.5*(53.13+44)))
    [(4-5)^2+(5-5)^2+(5-5)^2+(3-5)^2+(8-5)^2]/5
    arccos(0.6)
    [(1-5)^2+{(2-5)^2}*3+(3-5)^2]/5
    ln0.1
    5*(-4/3)

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