The diagram represents a building, \(PQ\), built on horizontal ground. The height of the building is 48 m.
From a point \(R\), the angle of elevation of the top of the tower is \(40^\circ\).
Point \(S\) is 18 m from \(R\) and \(QRS\) is a straight line.
Calculate the angle of depression of point \(S\) from the top of the building.[4]
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