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    arctan3.81
    (2√3+4)^2=
    -arctan7
    -arctan5
    -arctan3
    -arctan2
    -arctan1.5
    -arctan1
    -arctan0.5
    -arctan0.2
    1-1
    10×12+2×4+10+18×2×2.5+10×5
    10×12+2×4+10
    10×4+2×2+10+18×2×2.5+10×5
    10×8+2×4+10+18×2×2.5+10×5
    10×4+2×2+10+18×2×2.5
    10×8+2×4+10+18×2×2.5
    abs-3
    6500×(100.04/100)×(99.86/100)×(98.28/100)×(96.45/100)×(92.17/100)×(90.08/100)
    cos60

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