(100/3)(10cos(x)-5/cos(x))=(50cos(x)-10sin(x))(5sin(x))/cos(x)
    134760x+1193430000＝16.1×1600×0.9×138.75×(0.9x-0.45×138.75)
    (100/3)(10cos(x)-5/cos(x))=(250cos(x)-50sin(x))(sin(x))/cos(x)
    (100/3)(10cos(x)-5/cos(x))=(250cos(x)-50sin(x))(5sin(x))/cos(x)
    (100/3)(10cos(x)-5/cos(x))=(250cos(x)-50sin(x))(sin(x))/cos(x)
    (100/3)(10cos(x)-5/cos(x))=(250cos(x)-50sin(x))(sin(x))/cos(x)
    76308x+861589440＝16.1×1500×0.9×126.46×(0.9x-0.45×126.46)
    76308000x+861589440＝16.1×1500×0.9×126.46×(0.9x-0.45×126.46)
    76.308x+861589440＝16.1×1500×0.9×126.46×(0.9x-0.45×126.46)
    c^2+2c-333=2
    76.308x+861589.44＝16.1×1500×0.9×126.46×(0.9x-0.45×126.46)
    76308x+861589440＝16.1×1500×0.9×126.46×(0.9x-0.45×126.46)
    76308x+861589440＝16.1×1500×0.9×126.46×(0.9x-0.45×126.46)
    76308x+861589440＝208553.391x-13185208.831
    (100/3)(10cos(x)-5/cos(x))(tan(x))=(250cos(x)-50sin(x))(5tan(x)sin(x))/cos(x)
    c^2-3^(3/2)c+7=0
    x=ln(2/2-x)
    2x^2+x-1=0
    2x^2+x-1=0
    x^2+x+2=0

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