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DOES ANYONE SEE WHY MY LATEX FORMULAE ARE NOT BEING GENERATED?

I was wondering how one can differentiate the following:

[tex] arctan (x/y) [/tex]

wrt y

is it just inner times outer derivative, i.e.

[tex] (-x) /((1 + x^2/y^2)*y^2) [/tex]

in the definitions I found they just gave examples like

[tex] tan^(-1) y [/tex]

thanks very much

I was wondering how one can differentiate the following:

[tex] arctan (x/y) [/tex]

wrt y

is it just inner times outer derivative, i.e.

[tex] (-x) /((1 + x^2/y^2)*y^2) [/tex]

in the definitions I found they just gave examples like

[tex] tan^(-1) y [/tex]

thanks very much

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