Mathematics
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    (0.575×5.24+0.45×1.67+0.7×17.49+0.65×4.3)/28.7=
    314×(tan(45+15.738/2)*tan(45+15.738/2))+2×12.827×tan(45+15.738/2)=
    314×(tan(45-15.738/2)*tan(45-15.738/2))-2×12.827×tan(45-15.738/2)=
    (8×5.24+7×1.67+14×17.49+16.2×4.3)/28.7=
    (22×5.24+30.8×1.67+12.9×17.49+13.8×4.3)/28.7=
    17.8×5.24+19.2×1.67+17.8×(8.33-1.67-5.24)+(17.8-9.8)×(17.49-8.33+1.67+5.24)+(17.9-9.8)×4.3=
    157.45+142.55+20=
    121.142+142.55+20=
    0.7×9.8×(24.25-3.47)=
    0.689×228.52=
    (0.7×19.11+0.65×5.14)/24.25=
    228.52×(tan(45-13.091/2)*tan(45-13.091/2))-2×14.466×tan(45-13.091/2)=
    228.52×(tan(45+13.091/2)*tan(45+13.091/2))+2×14.466×tan(45+13.091/2)=
    228.52×(tan(45+13.091/2)*tan(45+13.091/2))+2×14.466×tan(45+13.091/2)=
    (14×19.11+16.2×5.14)/24.25=
    (12.9×19.11+13.8×5.14)/24.25=
    17.8×3.47+(17.8-9.8)×(19.11-3.47)+(17.9-9.8)×5.14=
    63.187+148.24+20=
    34.658+148.24+20=
    0.7×9.8×(11.63-(-9.98))=

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