-180=arctan0.5*x
    20x-(20*(800-x))-(60*(400-x))
    30x-(20*(800-x))-(60*(400-x))
    35x-(20*(800-x))-(60*(400-x))
    3.5x*（（3.5x/(3.5+2x)）^(1/6))*（1/0.015）*(（0.113*3.5x/(3.5+2x))^(1/2) ) = 62.07
    3.5x*（（3.5x/(3.5+2x)）^(1/6))*（1/0.015）*(（0.113*3.5x/(3.5+2x))^(1/2)=62.07
    3.5x*（（3.5x/(3.5+2x)）^(1/6))*（1/0.015）*((（0.113*3.5x/(3.5+2x))^(1/2)) = 62.07
    3.5x*（（3.5x/(3.5+2x)）^(1/6))*（1/0.015）*((（3.5x/3.5+2x)*0.113）^(1/2) )= 62.07
     3.5x*（（3.5x/(3.5+2x)）^(1/6))*（1/0.015）*(（3.5x/3.5+2x)*0.113）^(1/2) = 62.07
    cos(2*x)^2*cos(3*x)^2=0.5
    cos(2*x)*cos(3*x)=0.5
    cos(x)^2*cos(3*x)^2=0.5
    56Q-(580+40Q)-(56Q*0.13-5Q)*0.12
    cos(x)*cos(3*x)=0.5
     3.5x（（3.5x/(3.5+2x)）^(1/6))（1/0.015）(（3.5x/3.5+2x)0.113）^(1/2) = 62
     3.5x（（3.5x/(3.5+2x)）^(1/6))（1/0.015）(（3.5x/3.5+2x)0.113）^(1/2) = 62.07
    x^3-2x+4=0
     3.5x（（3.5x/(3.5+2x)）^(1/6))（1/0.015）((（3.5x/3.5+2x)0.113）^(1/2) )= 62.07
    cos(x)^2*cos(2*x)^2=0.5
    cos(x)^2*cos(2*x)^2=0

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