:r 9. Consider the curve given by: 2ercten () = erceos 1 y . D) y ( ) (a) m Find dy 2 dz (z,y)=(1,1)' - '5 (b) H} One may observe that when . as a: = 1.0041 there is a unique y such that [22, y) is a point on this curve. Use either linear approximation or differentials to prove that y A: 1.002. 4