-90-arctan(sqrt(2))-arctan(0.5*sqrt(2))
    tan17.02
    tan31.31
    (3943×10^3×18544788.6)/(12868257201×30)
    (1971.5×10^6)/32243190.2
    (1971.5×10^6)/23148510.9
    12868257201/(955-399.1-30)
    12868257201/399.1
    12868257201/(955-399.1)
    900×30×(399.1-15)
    900×30×(399.1-15)+4×30×(399.1-30)×(399.1-30)/2
    √(〖(246.4/347.2)〗^2+〖(302/560)〗^2 )
    (1971.5×0.5)/(〖0.55〗^2×10+〖0.2〗^2×6)
    (3943×10^3×14704795.2)/(10479770598.6×30)
    (1971.5×10^6)/25660554.8
    (1971.5×10^6)/18334098.3
    10479770598.6/(980-408.4-30)
    10479770598.6/408.4
    10479770598.6/(980-408.4)
    700×30×(408.4-15)

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