L[sin @ot] L[t"f(t)=(-1) d"F(s 2 2 s-+ 20 Lt]=(1.( as s+( (s2+O02) 0n 3s-a (S4+Oo)n n n n ds d F s L t f t s L t ( ) [sin ] [ ( )] ( 1) 2 0 2 0 0 = − + =    2 3 0 2 2 0 2 0 2 2 0 2 0 2 0 2 0 2 2 2 0 2 ( ) 2 (3 ) ] ( ) 2 [ sin ] ( 1) ( ) [         + − = + − = + = − s s ds s d ds s d L t t