3/4+1/7
    cos(x - 0.28) + (3.42 - x) * sin(x - 0.28) = 0
    60x^2+60x+73-800=0
    1/12*144*11^3+144*11*(39.3-11/2)^2+1/12*18*130^3+18*130*(130/2-39.3)^2
    1/12*144*113+144*11*(39.3-11/2)^2+1/12*18*1303+18*130*(130/2-39.3)^2
    1/12*144*113+144*11*(39.3-11/2)2+1/12*18*1303+18*130*(130/2-39.3)2
    cos(acos(1) / 2 −x+acos(1))+(−acos(1) / 2 +x)sin(acos(1) / 2 − x + acos(1)) = 0
    ((160-16)*11*11/2+130*16*130/2)/((160-16)*11+130*16)
    cos(acos(1) / 2 −x+acos(1))+(−acos(1) / 2 +x)sin(−acos(1) / 2 − x + acos(1)) = 0
    {x-52.71-(x*0.13)-4.12-(x*0.36)}/3.1-8.3-10=19.22
    0.65*x+(4.52*10^(-15))*x^3=1.67*10^(-29)
    0.65x+(4.52*10^(-15))x^3=1.67*10^(-29)
    cos(acos(0) / 2 −x+acos(0))+(−acos(0) / 2 +x)sin(−acos(0) / 2 − x + acos(0)) = 0
    x^3+3x^2+3x+4
    cos(1.09955741+x)+(2.04203454−x)*sin(1.09955741+x)=0
    cos(1.09955741+x)+(2.04203454−x)=0
    cos(1.09955741+x)=0
    {x-54.84-(x*0.173)-7.42-(x*0.36)}/3.1-18-10=23.68
    cos(x)=0
    2*x=tanx

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