# Errata: In Example 6.8, the state space dynamics have errors in the trigonometric terms

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Location: page 191, line -5

In Example 6.8, the original dynamics were transcribed incorrectly and the two trigonometric terms appearing in the unforced dynamics (first vector) are incorrect. The correct equations are:

These errors to not affect any subsequent calculations.

(Contributed by F. Juillet, 7 Apr 2010 & J. Adkins, 7 Jun 2010)