[200-200*cos(0.4*π)]^(1/2)
    200-200*cos(0.4π)
    200-200*0.4*π
    0.225*27-2.7*3
    0.225*9-2.7*3
    0.225*（-8）+5.4
    0.225*8-5.4
    50/(e^3)
    (6*2.29*2.29-4)/(e^2.29)
    (6*2.29*2.29-4)/(e2.29)
    -8/64+2/8+2.1
    0.225*8-2.7^2
    1/3sin15+2cos5-2.5-1/3sin0-2cos0
    1/3sin(15)+2cos5-2.5-1/3sin0-2cos0
    cos(3*4.28)-2sin(4.28)-0.5
    cos(3*1.14)-2sin1.14-0.5
    -3sin9-2cos3
    1/3*sin15+2cos5-2.5-2
    0.5*25*sin50*sin18/(sin112)
    5*sin50/sin112

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