for integration in two variables, say x and y(adsbygoogle = window.adsbygoogle || []).push({});

let the original formula have dxdy

when can i change it into dydx? and how to do that ?

And also: Why ?

the only reason for doing that i know till now is for example i have a function that is easy-to-integrate w.r.t. y but not w.r.t x, so i do make dy before dx to integrate the function w.r.t y then x, instead if x then y

But how i do that ? and When ? And Why ( Another reasons .. ) ?

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# { changing dxdx to dydx }, When ? and How ?

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