2x*(3/2x-1/(((2^(1/2))*tan(2^(1/2)*x)))-2/(tan(2x))) = 3
    (x-6)(x+1)-8=0
    X^2-5x-8=0
    2x*(3/2x-1/((2^(1/2))*tan(2^(1/2)*x))-2/(tan(2x))) = 3
    x*x*x*x*x*x+17*x*x*x*x+16x*x=10000
    x*x*x*x*x*x+17*x*x*x*x+16x=10000
    x*x*x*x*x*x+17*x*x*x*x+16*x*x=10000
    x*x*x*x*x*x+17x*x*x*x+16x*x=10000
    2x*(3/2x-1/((2^1/2)*tan(2^1/2*x))-2/(tan(2x)) ) = 3
    74-x=15
    2x*(3/2x-1/((2^1/2)*tan(2^1/2*x))-1/(tan(2x))=3
    74-x=15
    ln0.3＝(-x*π)/(sqrt(1-x^2))
    50x+xx＝611
    50x+x2＝611
    9%=A*10.8%+(1-A)*2.7%
    x=sqrt(4+64/9)
    2/7=sqrt(4+x^2)/(x+9)
    9+4x=0
    -90-arctan(0.2*x)-arctan(0.0625*x)-arctan(43*x)+arctan(3.3*x)=-180

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