Let $A = \left( \begin{array} { c c } 0 & 1 \\- 1 & 0\end{array} \right)$

question 1

Multiple Choice

Let $A = \left( \begin{array} { c c } 0 & 1 \\- 1 & 0\end{array} \right)$ . Then $e ^ { A t } =$

• A) \(I \cos t + A \sin t\)
• B) \(I \cos t - A \sin t\)
• C) \(l e ^ { t } + A e ^ { - t }\)
• D) \(l e ^ { - t } + A e ^ { - t }\)
• E) \(I \cosh t + A \sinh t\)

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