Question: gcdex procedure and extended euclidean algorithm

I am trying to find the maple procedure to do the extended euclidean algorithm which computes the gcd(A, B) such that the gcd(A, B) = A*r + B*s for some integers r and s. I want the integers r and s.

is gcdex() the right maple procedure (I cannot get it to work). Or what procedure can I use?

 

-Thanks

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