=× 4-X2 2- (023 de(X-Xi(-xs de(X-X4)(-X3 2x)(x12 d=(x-×nx-×) ( x3-×) ②2 N atural Coordinate sy≤lw he functions loo& simpler when exe ressed in terms o the local coorotunete system 3 b the transformtion feom""toxis X=A-×A+1+×B 2