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If u(t)=(tsint,t,t23)\mathbf { u } ( t ) = \left( - \sqrt { t } \sin t , t , t ^ { \frac { 2 } { 3 } } \right)

question 35

Essay

If u(t)=(tsint,t,t23)\mathbf { u } ( t ) = \left( - \sqrt { t } \sin t , t , t ^ { \frac { 2 } { 3 } } \right) and v(t)=(tsint,cos2t,t13)\mathbf { v } ( t ) = \left( - \sqrt { t } \sin t , \cos ^ { 2 } t , - t ^ { \frac { 1 } { 3 } } \right) , compute ddt(u(t)v(t))\frac { d } { d t } ( \mathbf { u } ( t ) \cdot \mathbf { v } ( t ) ) and ddt(u(t)u(t))\frac { d } { d t } ( \mathbf { u } ( t ) \cdot \mathbf { u } ( t ) ) .


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