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

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Sec. 3]_Asym<strong>pt</strong>otes_95<br />

Solution. S<strong>in</strong>ce<br />

lim t/ = oo,<br />

the straight l<strong>in</strong>e x = is a vertical asym<strong>pt</strong>ote (lower). Let us now test the<br />

curve only for the <strong>in</strong>cl<strong>in</strong>ed right asym<strong>pt</strong>ote (s<strong>in</strong>ce x>0).<br />

We have:<br />

k= lim = 1,<br />

X++OD X<br />

b lim (y x) = lim \nx oo.<br />

*-*+ 00 #->+<<br />

Hence, there is no <strong>in</strong>cl<strong>in</strong>ed asym<strong>pt</strong>ote.<br />

If a curve is represented by the parametric equations x = cp(0i */ = ^(0<br />

then we first test to f<strong>in</strong>d out whether there are any values of the parameter /<br />

for which one of the functions cp (t) or \|> (/) becomes <strong>in</strong>f<strong>in</strong>ite, while the other<br />

rema<strong>in</strong>s f<strong>in</strong>ite. When (p(/ )=oo and ty(t ) = c, the curve has a horizontal<br />

asym<strong>pt</strong>ote y c. When \j)(f ) = oo and (p(V ) = c, the curve has a vertical<br />

asym<strong>pt</strong>ote x = c.<br />

If ;<br />

y r s<strong>in</strong> = ) s<strong>in</strong> (p.<br />

F<strong>in</strong>d the asym<strong>pt</strong>otes of the follow<strong>in</strong>g curves:<br />

901. 11 = -,<br />

903. y = .<br />

^rr.<br />

908. u = x 2<br />

909. y = e-<br />

910. i/=<br />

911.<br />

905. y^Y^^l. 912.<br />

906. y==- 913 -<br />

907.

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