$$\text { Find the derivative } \frac { d } { d t } \left[ \mathbf { r } ( 4 t ) \cdot \mathbf { r } \left( t ^ { 4 } \right) \right]$$

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The Answer of $$\text { Find the derivative } \frac { d } { d t } \left[ \mathbf { r } ( 4 t ) \cdot \mathbf { r } \left( t ^ { 4 } \right) \right]$$

$\text { Find the derivative } \frac { d } { d t } \left[ \mathbf { r } ( 4 t ) \cdot \mathbf { r } \left( t ^ { 4 } \right) \right]$