Finding the 1th Order Derivative of Function (50-x)*（4000+200x)-400（50-x） on x
    Finding the 1th Order Derivative of Function -x*cos(x) on x
    Finding the 1th Order Derivative of Function dy/darctan（e*x） on x
    Finding the 1th Order Derivative of Function 1/tan2x on x
    Finding the 1th Order Derivative of Function arctan（e*x） on x
    Finding the 1th Order Derivative of Function （e∧x-1）/x on x
    Finding the 1th Order Derivative of Function 2√（x-1）＋3√（20-5x） on x
    Finding the 1th Order Derivative of Function 2√（x-1）＋3√（20-5x） on x
    Finding the 1th Order Derivative of Function x*x on x
    Finding the 2th Order Derivative of Function 1/(x(x+3)) on x
    Finding the 2th Order Derivative of Function 1/(x(x+3)) on x
    Finding the 2th Order Derivative of Function 1/x(x+3) on x
    Finding the 1th Order Derivative of Function arctan［（1-x）/（1+x）］ on x
    Finding the 1th Order Derivative of Function arctan（1-x）/（1+x） on x
    Finding the 1th Order Derivative of Function arctan1－x/1＋x on x
    Finding the 1th Order Derivative of Function arctan1-x/1+x on x
    Finding the 1th Order Derivative of Function x/（x+lnx） on x
    Finding the 1th Order Derivative of Function x/x+lnx on x
    Finding the 1th Order Derivative of Function （x^4+1）÷（x+x^3） on x
    Finding the 1th Order Derivative of Function （x^4+1）÷（x-x^3） on x

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