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)
    2759.94*0.5=
    arccos(3/5)/360×2×sqrt(5)-sqrt(2)/2
    1/8.02/4.6^0.5
    90-arctan(0.1*5.47)-arctan(0.2*5.47)
    (1+sin50)/(1-sin50)
    90-arctan(0.1*6.32)-arctan(0.2*6.32)
    90-arctan(0.1*5)-arctan(0.2*5)-arctan(0.06*5)-arctan(12*5)+arctan(0.3*5)+arctan(2*5)
    (1+sin40)/(1-sin40)
    90-arctan(0.1*5)-arctan(0.2*5)-arctan(012*5)+arctan(2*5)
    150*10^0.5/7.5/7.5
    1430.244+1329.696
    1/7.5/10^0.5
    (1+sin55)/(1-sin55)
    90-arctan(0.2*7.5)-arctan(0.1*7.5)
    （4*11.71+20.96*8.24+793.59*3.41+31.4*0.22-92.28*10.64-2.75*0.019）/5.64
    1/4×1

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