arctan((1071/64)^0.5/9.125)
    (100-1071/64)^0.5
    (64-1071/64)^0.5
    64-1071/64
    (1071/64)^0.5
    15%*200*475/（200*475+2800*160）+11.25%*2800*160/（200*475+2800*160）
    14÷18.17
    【86336-20500/（16.15-10.8075）】*16.15
    480*（40-28）-550-150*（50-27.5）
    1367-44√3
    4424:7
    1.71828*e^e-e+1.5
    (e-1)*e^e-e+1.5
    e^3-e^2+3
    2*e^2-e^3-3
    144/18
    (1-cos(0.17857))/(1-sqrt(3)/2)
    (1-cos(0.17857)/(1-sqrt(3)/2)
    4*sin(0.095365)*(1-cos(0.095365))/(2-sqrt(3))
    4*sin(0.095365)*(1-cos(0.095365)/(2-sqrt(3))

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