\;\text " Let "\; f(x)=\{\table \;{e^{x}-1+a x}/{x^{2}}, , x > 0 ; b, , x=0 \;\text " then "\; ; \;{\sin {x}/{2}}/{x}, , x < 0 .

0 ; b, , x=0 \;\text " then "\; ; \;{\sin {x}/{2}}/{x}, , x < 0 . " > 0 ; b, , x=0 \;\text " then "\; ; \;{\sin {x}/{2}}/{x}, , x < 0 . ">

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