(0.5+1.12)/(2+1.12)=
    291083.22/31.9225
    0.423×12×57345
    (0.5+0.60)/(2+0.60)=
    (34615+29630)/57345=
    9656+15376+18053+9971
    0.190×12×77143
    318446.304/17.64
    0.344×12×77143
    1.05/(2+1.05)=
    (36000+36000+45562.5+45562.5)/(2×77143)=
    (tanarccos0.60-tanarccos0.95)×275.11
    (tanarccos0.60-tanarccos0.95)×268.45
    tanarccos0.60-tanarccos0.95
    tanarccos0.77-tanarccos0.93
    420×tanarccos0.77-tanarccos0.93
    275.11×tanarccos0.60-tanarccos0.95
    √2/√5
    10×4/1
    271234.788/17.64

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