(d/dx)[cos(1-x2)2]=
-2x(1-x2)sin(1-x2)2
-4x(1-x2)sin(1-x2)2
4x(1-x2)sin(1-x2)2
noneofthese
Option(C):y=cos1-x221-x22=zy=coszDifferentiatewithrespectto'x'dydx=ddxcosz×dzdzdydx=ddzcoszdzdxdydx=-sinz-4x1-x2dydx=4x1-x2sin1-x22Henceoption(C)iscorrect