Question: Finding zero slope of an implicit function

Dear All,


I have an implicit function f(x,y) in terms of special functions. I need to optimize it.  So  I plotted it and found the location of the zero slope. However I cannot get the precise value of x and y, where the slope equals  zero.


Is there any better option to get the location of x and y, where the slope is zero?


Thanks in advance.

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