Find the Arc Length of the Curve Defined By $\vec { r } ( t ) = \langle 1 + \cos ( 3 t ) , 1 + \sin ( 3 t ) \rangle$

Short Answer

Find the arc length of the curve defined by $\vec { r } ( t ) = \langle 1 + \cos ( 3 t ) , 1 + \sin ( 3 t ) \rangle$ over $[ 4,7 ]$