$$\text { Find } \mathbf { r } ^ { t } ( t ) \text { and } \mathbf { r } ^ {tt } ( t ) \text { for } \mathbf { r } ( t ) = \langle t \cos 9 t - \sin 9 t , t \sin 10 t + \cos 10 t \rangle$$

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The Answer of $$\text { Find } \mathbf { r } ^ { t } ( t ) \text { and } \mathbf { r } ^ {tt } ( t ) \text { for } \mathbf { r } ( t ) = \langle t \cos 9 t - \sin 9 t , t \sin 10 t + \cos 10 t \rangle$$

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