(14) (a>0) n 1 (15) sIn nsin 2.讨论下列级数是否绝对收敛或条件收敛 ()(= n+x sin(2 x) n sin nx 0<x<丌) cos nx <x<丌 ∑=(p>0 6∑,(y(p>0 [n+(-1)] (-1) (1-12"sin""x ∑(a.ma (0∑(-1)"r“(r>0) n(14) 1 1 ( 1) 1 n n n a n a  + = − +  ( 0); a  (15) 1 1 sin( ) ; n n n n  = +  (16) 2 1 sin sin . n n n n  =  2．讨论下列级数是否绝对收敛或条件收敛: (1) 1 ( 1) ; n n n x  = − +  (2) 1 sin(2 ) ! n n x n  =   (3) 1 sin n nx n  =  (0 );   x  (4) 1 cos p n nx n  =  (0 );   x  (5) 1 ( 1) 1 n n p n n  = − +  ( 0); p  (6) 2 ( 1) [ ( 1) ] n n p n n  = − + −  ( 0); p  (7) 1 1 ( 1) ; n p n n n  + = −  (8) 2 1 1 2 sin ( 1) ; n n n n x n  − =  − (9) 1 ( ) , n n n x a  =  lim 0; n n a a → =  (10) 1 ( 1)n n n n r  + =  − ( 0); r  (11) 1 !( ) ; n n x n n  = 