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

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Sec. 9] L' Hospital-Bernoulli Rule for Indeterm<strong>in</strong>ate Forms 81<br />

781.<br />

,. sec 2 A- 2tan* n<br />

'<br />

1+COS4*<br />

x + 785. lim-<br />

782. lim^.<br />

^Ji tan5x<br />

786. lim<br />

x<br />

*-cot^<br />

1 [,<br />

2<br />

S )<br />

783. lim .<br />

s y 787. lim (1 cos x) cot x<br />

*-" . x->o<br />

, i . 1 n x<br />

1. lim -r-?=r .<br />

Solution, lim (1 ^cos x) cot , = Hm ^ cos A<br />

'^- lim<br />

Sill AT X->0 Sill A<br />

; l<strong>in</strong>rZi!iJ^(<br />

788. lim(l A*) Ian ~ .<br />

,V-^l<br />

a<br />

792. lim x" s<strong>in</strong> -,<br />

^ 'V<br />

X^X<br />

789. lim arc s<strong>in</strong> x cot x. 793. hnilnxln (x 1).<br />

X-+Q<br />

790. lim(jc ri<br />

e?"*), n>0. 794. lim f^ n"^ %<br />

A ] lr<br />

v^o ^ *i \<br />

791. lim x s<strong>in</strong> .<br />

Solution.<br />

A 1<br />

[- n A' 1<br />

,<br />

A 1 11 A A<br />

= lim = lim -7 T-<br />

j<br />

j<br />

^^MiiA-l x<br />

(A 1)<br />

~ >l \nx [ -1 *^ ]<br />

h~?<br />

A X A A' 2<br />

= lim<br />

795. lim<br />

796. lim<br />

y A)<br />

797 limf-^ ^}<br />

^Vc ^' 2cosx/<br />

* * 2<br />

798. lim A;*.<br />

L__l<br />

_^/ AO J<br />

Solution. We have ** = r/; In y=?x In A". lim In t/ = limjtln x =<br />

s lim p = lim<br />

j~<br />

0, whence lim//=l, that is, ImiA^ l.

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