Finding the 3th Order Derivative of Function -1/（1+x^2）/（-1/x^2） on x
    Finding the 1th Order Derivative of Function -1/（1+x^2） on x
    Finding the 1th Order Derivative of Function -1/1+x^2 on x
    Finding the 1th Order Derivative of Function sec（x）^2 on x
    Finding the 1th Order Derivative of Function ln(cot(2t)) on t
    Finding the 1th Order Derivative of Function lntant on t
    Finding the 1th Order Derivative of Function 4ln((x^(1/2)-1))+x on x
    Finding the 1th Order Derivative of Function 4ln(abs(x^(1/2)-1))+x on x
    Finding the 1th Order Derivative of Function ln(cot(2t))/ln(tan(t)) on t
    Finding the 1th Order Derivative of Function x*(e^x)-e^x on x
    Finding the 1th Order Derivative of Function x*(e^x) on x
    Finding the 1th Order Derivative of Function 2cos(x∧2＋x＋1) on x
    Finding the 1th Order Derivative of Function lncot2t/lntant on t
    Finding the 1th Order Derivative of Function 2cos(x∧2) on x
    Finding the 1th Order Derivative of Function x^2*(e^(x)) on x
    Finding the 1th Order Derivative of Function x^2*(e^(-x)) on x
    Finding the 1th Order Derivative of Function x^2*(e^(-t)) on x
    Finding the 1th Order Derivative of Function -(ln(e^x))^2*（e^(-x))+(e^x) on x
    Finding the 1th Order Derivative of Function -(ln(e^x))^2*(e^(-t))+(e^t) on x
    Finding the 1th Order Derivative of Function （ln(1/x)）^2 on x

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