Let r be the function defined by r(t) = (/10sen t,t, /10 cos t) where the coordinates of r(t) are measured in meters. For security purposes, a concertina that starts at the point (0,0, v10) and is contained in the dash of r has been installed. Knowing that the concertina enas on the equation surface 2² + y+ z² = 20, How many meters of concertina did it take to install it? O 9/īīm O 8/I0m O 5/7 m O 10/11 m O 7/13 m

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