Verify that ( f_{x y}=f_{y x} ) for the functions (a) ( (2 x-y) /(x+y) ), (b) ( x tan x y ), and (c) ( cosh (y+ cos x) ), indicating possible exceptional points, and investigate these points.

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Verify that  ( f_{x y}=f_{y x}  ) for the functions (a)  ( (2 x-y) /(x+y)  ), (b)  ( x  tan x y  ), and (c)  (  cosh (y+ cos x)  ), indicating possible exceptional points, and investigate these points.

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(Solved): Verify that \( f_{x y}=f_{y x} \) for the functions (a) \( (2 x-y) /(x+y) \), (b) \( x \tan x y \) ...

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