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Let $\mathbf { r } ( t ) = - \sin t \mathbf { i } + \cos t \mathbf { j } - e ^ { - t } \mathbf { k }$

Question 66

Multiple Choice

Let $\mathbf { r } ( t ) = - \sin t \mathbf { i } + \cos t \mathbf { j } - e ^ { - t } \mathbf { k }$ Then $\mathbf { r } ^ { \prime } ( t )$ is

A) $- \cos t \mathbf { i } + \sin t \mathbf { j } + e ^ { - t } \mathbf { k }$
B) $- \cos t \mathbf { i } - \sin t \mathbf { j } - e ^ { - t } \mathbf { k }$
C) $\cos t \mathbf { i } - \sin t \mathbf { j } + e ^ { - t } \mathbf { k }$
D) $- \cos t \mathbf { i } - \sin t \mathbf { j } + e ^ { - t } \mathbf { k }$
E) $\cos t \mathbf { i } - \sin t \mathbf { j } - e ^ { - t } \mathbf { k }$

Let r(t)=−sin⁡ti+cos⁡tj−e−tk\mathbf { r } ( t ) = - \sin t \mathbf { i } + \cos t \mathbf { j } - e ^ { - t } \mathbf { k }r(t)=−sinti+costj−e−tk

Multiple Choice

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Let $\mathbf { r } ( t ) = - \sin t \mathbf { i } + \cos t \mathbf { j } - e ^ { - t } \mathbf { k }$

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