P 0.1 Stabilişti natura şsi suma seriilor: a) Σ 1 n\ ; b) Σ arctan 1 n# + n ...
P 0.1 Stabilişti natura şsi suma seriilor: a) Σ 1 n\ ; b) Σ arctan 1 n# + n ...
P 0.1 Stabilişti natura şsi suma seriilor: a) Σ 1 n\ ; b) Σ arctan 1 n# + n ...
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4<br />
h)<br />
1X<br />
n=1<br />
( 1) n+1 (2n 1)!!<br />
:<br />
(2n)!!<br />
P <strong>0.1</strong>4 S¼a se stabileasc¼a <strong>natura</strong> <strong>seriilor</strong>:<br />
1X<br />
a) ( 1) n(n+1)<br />
2<br />
1X<br />
n=1<br />
n=1<br />
n100 ; b)<br />
2n n=1<br />
( 1) n(n+1)<br />
2 sin n p n + 1 :<br />
P <strong>0.1</strong>5 Determina¸ti valorile lui x 2 R pentru care seriile urm¼atoare<br />
sunt convergente:<br />
1X 1<br />
a)<br />
2 ;<br />
(n + jxj) n=1<br />
1X ( 1)<br />
b)<br />
n=1<br />
n x2n 2n (2n 1) ;<br />
1X x<br />
c)<br />
(1 + nx2 ) p ;<br />
n<br />
1X x<br />
d)<br />
1 + jxj p n :<br />
n=1<br />
n=1<br />
P <strong>0.1</strong>6 Pentru …ecare a 2 R, stabili¸ti <strong>natura</strong> <strong>seriilor</strong>;<br />
1X<br />
a) cos (na) sin a<br />
1X<br />
; b) sin (na) sin<br />
n a<br />
n ;<br />
c)<br />
1X<br />
n=1<br />
cos (na) tan a2<br />
; d)<br />
n<br />
1X<br />
e)<br />
n=1<br />
n=1<br />
1X<br />
n=1<br />
n<br />
( 1)<br />
[ 4 ] n + a<br />
ln 2<br />
n :<br />
sin (na) tan a<br />
n ;<br />
P <strong>0.1</strong>7 S¼a se arate c¼a pentru orice num¼ar <strong>natura</strong>l p are loc inegalitatea<br />
1X 1<br />
(n + 1) pp < p:<br />
n<br />
n=1