sin(x) = (1-cos(x))*9924.535
    sin(x) = (1-cos(x))*13924.535
    sin(x) = (1-cos(x))*6924.535
    （2505/tan(180-x)+510）*6.28*(180-x)/360 = 3850/2
    （2505/tan(180-x)+510）*6.28*(180-x)/260 = 3850/2
    sin(x)-(1-cos(x))*6924.1 = 0
    sin(x)-(1-cos(x))*6924 = 0
    sin(x)-(1-cos(x))*7000 = 0
    sin(x)-(1-cos(x))*9000 = 0
    sin(x)-(1-cos(x))*13849.341 = 0
    3x^3+x^2-14x-8=0
    3x^3+x^2-14^-8=0
    10000=65^-2x^3
    10.12x^3+13.38x^2-253.53x-2640.57=0
    330×2514=11.5×9900×x+330×452
    3x^3+x^2-14-8=0
    ((0.5*112.6335)/(1.07+x))+((0.5*112.6335)/(1.03+x))=101.865175
    10.12x^3+37.48x^2-257.04x-2467.21=0
    100*0.02*(1-1.07^(-5))/0.07
    10.12x^3+49.37x^2-149.04x-1706.18=0

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