180-90-arctan(3.77/20)-arctan(3.77/10)-arctan(3.77/4)
    6.93*(6.93/20+1)*(6.93/4+1)*(6.93/10+1)
    180-arctan(3.77/4)-arctan(3.77/20)-arctan(3.77/10)
    695*486219
    π/√(1-0.49*0.49)=
    sin32.36
    2arcsin0.875
    62.8×1/20×10÷2
    62.8×1/20
    2arcsin0.2786
    1.3/0.3×0.47^1.5×0.47^1.77/0.53
    1.3/0.3×0.40^1.5×0.40^1.77/0.6
    1.3/0.3×0.46^1.5×0.46^1.77/0.54
    1.3/0.3×0.45^1.5×0.45^1.77/0.55
    1.3/0.3×0.41^1.5×0.41^1.77/0.59
    1.3/0.3×0.44^1.5×0.44^1.77/0.56
    1.3/0.3×0.43^1.5×0.43^1.77/0.57
    1.3/0.3×0.42^1.5×0.42^1.77/0.58
    1.3/0.3×0.41^1.5×0.41^1.77/0.59
    1.3/0.3×0.40^1.5×0.40^1.77/0.60

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