A02688815 13 To get more insight into this situation, we should look at the second time derivative = E'n„Robsin(4.— th + bob) na = ZZ Ea IVC,n,- &h&c. sin(pa — + bob) sin(4),, + bob) + n = 7 7 „-4b + 6,")sin(0,, + bob) 670,70 (62) Notice that in the passage from the second to the third lin