Find $\mathbf { r } ^ { \tt } ( t )$

Find $\mathbf { r } ^ { \tt } ( t )$ for the function given.
$\mathbf { r } ( t ) = 8 \mathbf { i } + \sin t \mathbf { j } + \cos t \mathbf { k }$

A) $\mathrm { r } ^ { tt } ( t ) = - 8 \sin t \mathrm { j } - \cos t \mathrm { k }$
B) $\mathrm { r } ^ { tt} ( t ) = - \sin t \mathrm { j } - \cos t \mathrm { k }$
C) $\mathrm { r } ^ { tt } ( t ) = \cos t \mathrm { j } - \sin t \mathrm { k }$
D) $\mathrm { r } ^ { tt } ( t ) = - \sin t \mathrm { j } + 8 \cos t \mathrm { k }$
E) $\mathrm { r } ^ { tt } ( t ) = - 8 \cos t \mathrm { j } - \sin t \mathrm { k }$

Correct Answer:

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