120/42
    12/42=
    12/42
    ㏑3除以㏑2
    ㏑9-㏑2
    ㏑9-㏑4
    5.65√314.2
    0.468×0.0483
    0.468×0.0603
    1.20×1.3×0.3
    e^((-3.1415*(0.5))/sqrt(1-(0.25)))*100
    e^((-3.1415*(sqrt(2)/2))/sqrt(1-(0.5)))*100
    e^((-3.1415*(sqrt(3)/2))/sqrt(1-(3/4)))*100
    e^((-3.1415*(sqrt(3)/2))/sqrt(1-(3/4)^2))*100
    e^((-3.1415*0.866)/sqrt(1-(3/4)^2))*100
    e^((-3.1415*sqrt(3)/2)/sqrt(1-(3/4)^2))
    180+(arctan(2.6*3.5)-90-arctan(0.1*3.5)-arctan(0.2*3.5)-arctan(17.3*3.5))
    90-arctan(0.1*2.3)-arctan(0.2*2.3)
    90-arctan(0.1*9.7)-arctan(0.2*9.7)
    90-arctan(0.1*9.7)-arctan(0.2*9.7)

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