$$\text { For the curve given by } \mathbf { r } ( t ) = \langle 2 \sin t , 5 t , 2 \operatorname { cost } \} \text {, find the unit normal vector. }$$

Name: \[\text { For the curve given by } \mathbf { r } ( t ) = \langle 2 \sin t , 5 t , 2 \operatorname { cost } \} \text {, find the unit normal vector. }\]
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The Answer of $$\text { For the curve given by } \mathbf { r } ( t ) = \langle 2 \sin t , 5 t , 2 \operatorname { cost } \} \text {, find the unit normal vector. }$$