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Question 26
Let r(t) =etcos(t) i−etsin(t) j+(2−t) 2k\mathbf { r } ( t ) = e ^ { t } \cos ( t ) \mathbf { i } - e ^ { t } \sin ( t ) \mathbf { j } + ( 2 - t ) ^ { 2 } \mathbf { k }r(t) =etcos(t) i−etsin(t) j+(2−t) 2k Then r′(0) \mathbf { r } ^ { \prime } ( 0 ) r′(0) is
A) i−j+4k\mathbf { i } - \mathbf { j } + 4 \mathbf { k }i−j+4k B) i−j−4k\mathbf { i } - \mathbf { j } - 4 \mathbf { k }i−j−4k C) i+j−4k\mathbf { i } + \mathbf { j } - 4 \mathbf { k }i+j−4k D) −i−j+4k- \mathbf { i } - \mathbf { j } + 4 \mathbf { k }−i−j+4k E) −i+j−4k- \mathbf { i } + \mathbf { j } - 4 \mathbf { k }−i+j−4k
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