Mathematics
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    arctan((1-1/tan67)/(1-1/tan68))
    arctan((1-1/tan67)/1/tan68)
    (1-1/tan67)/1/tan68
    (29.1^2-25.2^2)×3.14+25.2^2×3.14×3.9+(3.14×(75.3/2)×(65.3/2)-2×(50.8/2×(60.8/2))-6×7×7×2)×280/360×2+6×7×7×2×3.9
    (29.1^2-25.2^2)×(3.14+25.2^2×3.14×3.9+(3.14×(75.3/2)×(65.3/2)-2×(50.8/2×(60.8/2))-6×7×7×2)×280/360×2+6×7×7×2×3.9
    -3-3
    arctan48.2608
    (-2)^3
    (-8)^(1/3)
    0.00783/2^(1/6)
    0.1*0.025*(9.81)^0.5
    0.4*2.5*0.0184
    (9.81*2.5*1.38*10^(-5))^0.5
    (9.81*2*0.0002)^0.5
    lg8
    lg4.4
    552.03×1.0×1.0×10%
    arctan(5÷71)
    arctan(1÷8)
    arctan(3.81)

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