(4)知F(p)= 求L[F()=? L(=|- p2+1p2+1 L. L cost* cost]=[cost cost -tdr cos(2τ-t)+ coSta( ) ( ) ( ) [ ( )] ? 1 4 1 2 2 2 = + = - L F p p p 已知F p 求 [ ( )] ú û ù ê ë é + × + = - - 1 1 2 2 1 1 p p p p L F p L [ ] ( ) ò = × * = - - t L L t t t d 0 1 cos cos cost cos t t [ ( ) ] ò = - + t t t d 0 cos 2 cos 2 1 t t