0.0228=(（2.07*10^5）/(4*3.1415926*x^2))*ln(x/91.33)
    0.0228=(（2.07*10^5）/(（4*3.1415926）*x^2))*ln(x/91.33)
    0.0228=（2.07*10^5）/(（4*3.1415926）*x^2)*ln(x/91.33)
    1/1200=0.7(x+2×3.9)0.0001
    n(n+2)=30.7018
    1/1200=0.00007x+0.00112
    15(sin(x))+20(sin(90-x))=25
    -0.5x²+1.5x=1
    -0.5x²+1.5x=0
    -0.5x²+1.5x+2=0
    6X^2+3X=36405603
    6X^2+3X-6.3=36405596.7
    6X^2+3X-6.3=36405596.7
    6X^2+3X-6.3=36405596.7
    6 x^2+3 x-6.3=36,405,596.7
    6 x^2+3 x-6.3=36,405,596.7
    6 x^2+3 x-6.3=36,405,596.7
    6 x^2+3 x-6.3=36,405,596.7
    6 x^2+3 x-6.3=36,405,596.7
    6 x^2+3 x-6.3=36,405,596.7

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