n=5, the value of n.

6. The position vector of a particle moving in space is given by r(t) = sin(nt2 + nt)i+ n 18 (12t + 15)3/2 j - cos(nt2 + nt)k, Find the distance travelled as the particle moves from the point ( 0, n 18 (15) 3/2, -1, to the point sin n n 18 (21)3/2, - cos -n