GIF89aQ@@@,Q0I8ͻ`(dihlp@x0PG $I@(hFh SNT޴ZVEzNh3[1e 6 {W[ wpF qquzj65UL]X 5dLy # Z%& m8 ?'" %"$[9nӮz%Z$,WIPaLW4k9dP| ądMx | H#%^: 1tPDmVo33! Is([F#=-5Z)~1)RVƌ-gʝKT4yx,XRֵn\Ȣ}7KLWS c 5)[GJ+{'S_8=J6վG2 w0-|-8m3v^ '.mעbg'KטYǞ&(@& aėv!hĀ(\R0# l0|`tH4=be, xs#,v@(:5j@K(W⊩(&tu7r_(`1'Pp0Y4B}lW,{I~3b0?%:3SwV*`~UlT#2 X D0\(`hsľ CIZ@بff<5a$$C gЩoЎf [}qER}0VxU#9F$*2,b2X0#`ł2Xщi5Q9^L9AT#4Y:(GIR4e! MathType001 F x (x,y)+F y (x,y)dydx=0F x (x,y)dx+F y (x,y)dy=0;