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Question 30
Let r(t) =sin(2t) i−cos(2t) j+5tk\mathbf { r } ( t ) = \sin ( 2 t ) \mathbf { i } - \cos ( 2 t ) \mathbf { j } + 5 t \mathbf { k }r(t) =sin(2t) i−cos(2t) j+5tk Then the unit tangent vector T(π4) \mathbf { T } \left( \frac { \pi } { 4 } \right) T(4π) is
A) 529j+229k\frac { 5 } { \sqrt { 29 } } \mathbf { j } + \frac { 2 } { \sqrt { 29 } } \mathbf { k }295j+292k B) −229j−529k- \frac { 2 } { \sqrt { 29 } } \mathbf { j } - \frac { 5 } { \sqrt { 29 } } \mathbf { k }−292j−295k C) 229j+529k\frac { 2 } { \sqrt { 29 } } \mathbf { j } + \frac { 5 } { \sqrt { 29 } } \mathbf { k }292j+295k D) 229j−529k\frac { 2 } { \sqrt { 29 } } \mathbf { j } - \frac { 5 } { \sqrt { 29 } } \mathbf { k }292j−295k E) −229j+529k- \frac { 2 } { \sqrt { 29 } } \mathbf { j } + \frac { 5 } { \sqrt { 29 } } \mathbf { k }−292j+295k
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