-7^4
    -2/3^4
    -1^4
    -1/3^4
    -1/2^4
    -2^4
    90-arctan(4*7.5)-arctan(0.02*7.5)-arctan(0.02*7.5)+arctan(1*7.5)
    9.96*（4.2/2）*32=
    1.71*[(55.2-0.2)*2+(18.6-0.2)*2]
    1.71*[(55200-200)*2+(18600-200)*2]
    90-arctan(0.1*7.5)-arctan(0.2*7.5)-arctan(0.0422*7.5)-arctan(11.24*7.5)+arctan(0.4216*7.5)+arctan(1.33*7.5)
    90-arctan(0.1*7.5)-arctan(0.2*7.5)
    90-arctan(0.1*7.5)-arctan(0.2*7.5)-arctan(0.06*7.5)-arctan(8*7.5)+arctan(1.33*7.5)+arctan(0.3*7.5)
    90-arctan(0.5)-arctan(1)
    90-arctan(0.4)-arctan(0.8)
    90-arctan(0.1*8.19)-arctan(0.2*8.19)-arctan(0.0546*8.19)-arctan(6.25*8.19)+arctan(1.25*8.19)+arctan(0.273*8.19)
    1/8.19/5^0.5
    90-arctan(0.1*8.19)-arctan(0.2*8.19)-arctan(0.0583*8.19)-arctan(6.25*8.19)+arctan(1.25*8.19)+arctan(0.2681*8.19)
    90-arctan(0.1*8.02)-arctan(0.2*8.02)-arctan(0.0583*8.02)+arctan(0.2681*8.02)
    90-arctan(0.1*8.02)-arctan(0.2*8.02)-arctan(0.0583*8.02)-arctan(6.25*8.02)+arctan(1.25*8.02)+arctan(0.2681*8.02)

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