(⑤)指数函数 (t)-ear F(s)=LIf(]=e"e "di e od= s+a
(5)指数函数 at f t e − ( ) = s a e dt F s L f t e e dt a s t a t s t + = = = = − + − − − − 1 ( ) [ ( )] 0 ( ) 0
(6)正弦函数 f(t)=sino t F(s)=LIf(t]=sin te-"di s2+02 2
(6)正弦函数 f (t) = sin t 2 2 0 . . 0 ) 1 1 ( 2 1 2 . ( ) [ ( )] sin + = + + − = − = = = − − − − − s j s j s j e dt j e e F s L f t te dt s t j t j t s t