Mathematics
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    2^6-[-2^4+(0.5*1/4-1)/(-7/4)]
    1-(2+1/12-25/4)*1/2
    4+2/3
    14/3
    (7/3-7/2+35/18)/(-7/6)*(-7)
    8/(0.88*0.133)
    (5/4)^26*0.8^25-(3^3-2^3)*(-1/7)
    (5/4)^26*0.8^26-(3^3-2^3)*(-1/7)
    2/[(-0.5)^3-1.5^2]-2/(-1/2)^3
    (-29-2/7)*(-1/5)
    -25-[-4+(1-0.2*1/5)*(-1/2)]
    -5^2-[-4+(1-0.2*1/5)*(-1/2)]
    (0.5-2/3)*3*[-2+27]-1/8
    (0.5-2/3)/1/3*[-2+27]-1/8
    (0.5-2/3)/1/3*[-2-(-3)^3]-1/8
    3/2*7/11-(-7/11)*5/2-1/2*7/11
    (19+19/20)*(-7)
    arccos0.32
    cos-1 0.32
    -2/3+1/4+(-1/6)+(-1/2)

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