sin(a)=5*16/256*cosa+0.21*cosa/16
    sin(a)=5*16/256*cos(a)+0.21*cos(a)/16
    sin(a)=5*12/144*cos(a)+0.21*cos(a)/12
    cos(x)*20=6
    x^x^4=64
    (-9.8/2)*x^2+18.2x=10.9
    170.2497+0.02881x=168.003+(x-11.2)/4
    170.2497-0.02881x=168.723+(x-11.2)/4
    172.1447-0.02212x=168.6567+(x-11.2)/4
    172.1447+0.02212x=167.9367+(x-11.2)/4
    173.0731+0.019455x=167.6002+(x-11.2)/4
    173.0731-0.019455x=168.3202+(x-11.2)/4
    1.5 + 0.07 * 50 + x * 200 = 6.46
    173.776-0.01154x=167.7136+(x-11.2)/4
    173.776+0.01154x=166.9936+(x-11.2)/4
    sin(a)=10*8/2*8^2*cos(a)+0.21*cos(a)/8
    1.5 + 0.07 * 50 + x * 200 = 1.5 + 0.07 * 12 + 0.035 * 200
    173.928+0.01202x=166.1168+(x-11.2)/4
    （2000-10x）^(2)>0.196×x
    173.928-0.01202x=166.8368+(x-11.2)/4

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