4) \( f(x)=4-x^{2} \) จาก \( x=-2 \) ถึง \( x=2 \)

(j.) \( y=\ln \sqrt{\frac{2}{x^{3}}} \)

\( \lim _ { n \rightarrow \infty } ( \frac { n } { n ^ { 2 } + 1 } + \frac { n } { n ^ { 2 } + 2 } + \cdots + \frac { n } { n ^ { 2 } + n } ) = \)

(j.) \( y=\ln \sqrt{\frac{2}{x^{3}}} \)

Sea la serie \( S=\sum_{k=1}^{\infty} \frac{2^{k}}{k!} \). La serie Ses:

If \( \left\langle a_{n}\right\rangle \) and \( \left\langle b_{n}\right\rangle \) are two sequences such that \( \lim _{n \rightarrow \infty} a_{n}=i, \lim _{n \rightarrow \infty} b_{n}=m \), then prove that: \( \lim _{n \rightarrow \infty}\left(a_{n}+b_{n}\right)=l+m \)