asin(x)=-x+1/x
    sin(x)=-x+1/x
    3x^3=-81
    16x^2-49=0
    sin(x)=(x-sqrt(2))^2
    x^(1/x)=1.1
    X^2+2X-8
    0.08x²+0.9 x=99
    （100-2X）(80-x) =608
    sqrt(3)*cos（a）-sin(a)=sqrt(3)sin(a)cos(a)+sin(a)*sin(a)
    （e^x）-1
    3x+3/2xx=120
    （30-x）（500+2x）=10400
    x^4-4x^3+6x^2-4x+2=0
    x^3-x+1=0
    sin（x）=1.0000000000000000000000000000000000000000000000000000000000000001
    0.5^x=x
    x+16=4840/x+10
    x*x*x=485.8997173333333333
    4k²－8k－8

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