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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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26 Introduction to <strong>Analysis</strong>_\Ch. I<br />

101. lim ^{. 198. Um<br />

* ^<br />

192. lim *-. 196. lim<br />

* _. * ^<br />

|<br />

*-+> fl<br />

The expressions conta<strong>in</strong><strong>in</strong>g irrational terms are <strong>in</strong> many<br />

ized by <strong>in</strong>troduc<strong>in</strong>g a new variable.<br />

we have<br />

Example<br />

4. F<strong>in</strong>d<br />

Solution. Putt<strong>in</strong>g<br />

lim<br />

lim E=1 Mm ^<br />

= lim "<br />

2<br />

!+* = */',<br />

199. lim -4^-. 201. lim<br />

X<br />

x<br />

- * l<br />

1<br />

200. lim T<br />

*~ .<br />

3/ ,<br />

,,. ,'~ t/x ~ ]<br />

cases rational-<br />

Another way of f<strong>in</strong>d<strong>in</strong>g the limit of an irrational expression is to transfer<br />

the irrational term from the numerator to the denom<strong>in</strong>ator, or vice versa,<br />

from the denom<strong>in</strong>ator to the numerator.<br />

Example 5.<br />

lim = = lim _^<br />

x -+a( X a)(Vx + V a)<br />

203. lim<br />

lim<br />

! !<br />

*-> a ^ jc -f V a 2\f~i<br />

Q-. 206. lim<br />

-49 -=f. __<br />

204. li.n j-^= . 207. lim<br />

*-* / x 2 *-+<<br />

1<br />

205. lim . ^L"" 208. lim<br />

*-+' / * 1 ^-*o

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