Gmail mall LTE 20:40 a docs.google.com Find the third order derivative of y = In(cos(2x))5. A. y' = -40sec2 (2x)tan(2x) B. y' = -80sec2 (2x)tan(2x) C. y' = 80sec2 (2x)tan(2x) D. y' = -80sec(2x) tan(2x) O A O B O C O D none of the above Find dy in y2 sin(x) +y = arctan(x) dx dy 1-y cos(x)(1+x2 ! A. dx 1+x2 2ysin(x) +1