Sherman-Morrison formula

Hi,

I am trying to derive the Sherman-Morrison formula for the following expression:
a*x*(b*AAH+I)-1*y, where a, b are non-negative scalar values. Also, vectors and matrices are represented by lowercase bold typeface and uppercase bold typeface letters, respectively. Also, (.)H and (.)-1 are the Hermitian transposition and inverse operation, respectively.

Any help would be useful.

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