xx(0.04xx+1)(0.0004xx+1)=100
    arctan(13.569706256544502617801047120419‬)=((-2.16*x)^2-1)^0.5
    xx(0.04xx+1)(0.0004xx+1)=10
    xx(0.04xx+1)(0.0004xx+1)=1
    20lg(x/0.775)=4
    18.8664/0.800817
    -(1-x)*(1-x)*lnX
    30*140*(0.0539/12)
    -(1-x)*(1-x)*lnX=18
    -(1-x)*(1-x)*lnX=18.42068
    1-(1/1.004492)^360
    x^4/256-4x-8
    4/3y*y+（2√3）/2y=15
    x^2/256-4x-8
    xxxx/256-4x-8
    8.25=(3.82/6.2831852)*tan(((2.16*x)^2-1)^0.5)
    8.25=(x/6.2831852)*tan(3.1415926-6.2831852/x)
    x^2-40x+400=0
    x^2-40x-400=0
    x^2-2x-3=0

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