Augmented sixth and its resolution

A selection from the third movement of Mozart's Piano Sonata in D Major, K. 284 (Var. VII)

The selection contains an Italian augmented sixth chord (at 0:05), followed shortly after by a German augmented sixth chord (at 0:10).  Augmented sixth chords were often used in the eighteenth century to add drama and tension to a piece.

This audio features an Augmented chord, which is very common in 18th century music, in either the Galant style or learned styles. This piece features the learned style.