Finding the 1th Order Derivative of Function （1-lnx）/x^2 on x
    Finding the 1th Order Derivative of Function arcsin(x/y) on x
    Finding the 1th Order Derivative of Function x/(1+x^2) on x
    Finding the 1th Order Derivative of Function x/(1+u^2) on x
    Finding the 1th Order Derivative of Function (1-x^2)/(x+x^3) on x
    Finding the 1th Order Derivative of Function (x-1)/2 on x
    Finding the 1th Order Derivative of Function u/(1+u^2) on x
    Finding the 1th Order Derivative of Function (1-u^2)/(u+u^3) on x
    Finding the 1th Order Derivative of Function (1-u^2)/u+u^3 on x
    Finding the 1th Order Derivative of Function 1-x^2/u^2+u^3 on x
    Finding the 1th Order Derivative of Function x（1-lnkx） on x
    Finding the 1th Order Derivative of Function cos2 on x
    Finding the 2th Order Derivative of Function √（x^2+4） on x
    Finding the 1th Order Derivative of Function √（x^2+4） on x
    Finding the 1th Order Derivative of Function x/（1+x） on x
    Finding the 1th Order Derivative of Function √（x/（1+x）） on x
    Finding the 1th Order Derivative of Function √（x^2+4） on x
    Finding the 1th Order Derivative of Function -sinx/x on x
    Finding the 1th Order Derivative of Function 1/x on x
    Finding the 1th Order Derivative of Function 1/2x on x

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