69/(cos13*cos13*cos13)
    (25×(tan29.653-tan20.483) +69×(tan24.35-tan20.483))/ (2π)
    (25×(tan29.653-tan24.35) +69×(tan23.827-tan24.35))/ (2π)
    (25×(tan29.653-tan24.35) +69×(tan23.827-tan24.35))/2π
    acos0.911046
    (69×cos20.483)/(69+2×1×cos13)
    √((2×2.211×72.1755×1000)/(1×44.925^3 )×(3.606+ 1)/( 3.606))×2.47×189.8×0.727×0.990
    1.25×3213.155/50
    2×1000×72.1755/44.925
    √(cos11.6498)
    √((4-1.6467)/3 (1-1.444)+1.444/1.6467)
    (1×22×tan11.6489)/π
    A(3,1)
    4%+1.6*（12%-4%）=
    0.04+1.3*（0.115-0.04）
    0.12-（0.04+1.1*(0.09-0.04)）
    0.12-（0.04+1.1*(0.12-0.04)）
    0.12-0.04+1.1*(0.12-0.04)
    0.28×0.98
    2*(-9)-18*(1/6-1/2)

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