Mathematics
         
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Derivative function
Function image
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Function image：
    The function image taken from the image library.
    Current location：Function image > Function Image Library > Image
Function Analytic Expresions:
y= arctan x / 2 * π
Derivative of function：
y'= 1 / 2 * ( x ^ 2 + 1 ) ^ -1 *
                           
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  New addition:Lenders ToolBox module（Specific location：Math OP > Lenders ToolBox ），welcome。