(2021-1987.754922)*(1987.754922-2018)
    196.992 +106.704+235.198+205.2=
    7.5*4*6.840=
    6.9*5*6.840=
    7.8*2*6.840
    7.2*4*6.840
    689.472+640.224=
    7.2*13*6.840
    221.616+1208.628=
    295.488+373.464+283.176+256.5=
    7.8*7*6.840=
    90-arctan(0.1*7.51)-arctan(0.2*7.51)-arctan(33.3*7.51)-arctan(0.1125*7.51)+arctan(3.33*7.51)+arctan(0.1598*7.51)
    1/7.515/1.4^0.5
    (1+sin10)/(1-sin10)
    90-arctan(0.1*3)-arctan(0.2*3)
    55.8*19.2=
    55.8*15.5*2.0+55.8*3*2.5=
    (1+sin25)/(1-sin25)
    90-arctan(0.1*4)-arctan(0.2*4)
    (1+sin45)/(1-sin45)

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