500×20×(117.7-10)+2×10×(440-342.3)×(440-342.3)/2
    √((130.56/1.22)^2+〖68.96〗^2 )
    (811.0×10^3)/(4×7×420)
    (186.53×10^6)/1428666.36
    (186.53×10^6)/2590049.39
    (4.30×10^8)/300.98
    (4.30×10^8)/(467-300.98)
    (880+4.2*4.2*1.2*24)/4.200/4.200
    (880+4.2*4.2*1.2*24)*1000/4200/4200
    (880+4.2*4.2*1.2*2.4)*1000/4200/4200
    arctan(3/4)-arctan(18/7)
    arctan(3/4)-arctan(18/7)
    arctan(-51/82)
    3.14/(4*sqrt(1-0.75^2))
    arctan(0.25*sqrt(5))
    arctan(sqrt(5))
    90+arctan(0.9*3.31)-arctan(0.02*3.31)-arctan(0.25*3.31)-arctan3.31
    90+arctan(0.9*3.31)-arctan(0.05*3.31)-arctan(0.25*3.31)-arctan3.31
    90+arctan(0.9*3.31)-arctan0.331-arctan(0.25*3.31)-arctan3.31
    180-90-arctan2-arctan0.5

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