G(O)= ∫f( (x)e dx 2丌 (2) f(x) G(ae do 2丌 G(o) √2兀 f(xe dx (3) √2z G(oe doï ï î ï ï í ì = = ò ò ¥ -¥ - ¥ -¥ w w p p w w w f x G e d G f x e dx i x i x ( ) 2 1 ( ) ( ) 2 1 ( ) ï ï î ï ï í ì = = - ¥ -¥ ¥ -¥ ò ò w w p p w w w f x G e d G f x e dx i x i x ( ) 2 1 ( ) ( ) 2 1 ( ) (2) (3)