Mathematics
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    1.1×1.25×25×(11×0.8×0.9+11×0.6×0.8+2×3×11×0.55×0.65)=
    7.5×10∧6
    10∧6
    2×2
    tan60
    -1.173333/0.694328
    (2.1-0.433)^2*(-0.28-0.0933)^2+(0.2-0.433)^2*(0.08-0.0933)^2+(-1-0.433)^2*(0.48-0.0933)^2
    (2.1-0.433)*(-0.28-0.0933)+(0.2-0.433)*(0.08-0.0933)+(-1-0.433)*(0.48-0.0933)
    cos0.1
    sin0.1
    sqrt(6)
     484-(154-87)
    484-(154-87)
    0.7×1.43×1100×742=
    1.25×1.1×0.5×435.25×7.5=
    1.25×1.1×0.5×280.82×7.5=
    arctan(0.0284/-0.0114)*180/3.1415
    arctan(0.0137/-0.055)*180/3.1415
    arctan(0.1389/-0.0556)*180/3.1415
    arctan(0.0774/-0.0309)*180/3.1415

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