100P-(580+40×100)-100× (P × 13%-5)×12%=60
    df
    -1166+721.2/(1+(x/12*3))+444.74/(1+(x/12*6))+36.06/(1+(x/12*18))=0
    -0.1055x+11.6610
    x*x-500*x+100=0
    (4*sqrt((0.5*x)^2+1))/(x*sqrt(4*x^2+1)*sqrt((1-x^2/64)^2+0.0025*x^2))=1
    (10x-61.25)*22.25-(122.5+5x)(x-5)=0
    -180=atan(0.5*x)-90-atan(2*x)-atan((0.05*x)/(1-(x^2)/64))
    -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

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