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

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Sec. 14] F<strong>in</strong>d<strong>in</strong>g the Greatest and Smallest Values of Functions 229<br />

2045. At what po<strong>in</strong>t of the ellipse<br />

r2 w 2<br />

-T- + TT-1<br />

'<br />

a 2<br />

does the tangent l<strong>in</strong>e to it form with the coord<strong>in</strong>ate axes a triangle<br />

of smallest area?<br />

2046*. F<strong>in</strong>d the axes of the ellipse<br />

b z<br />

5x 2<br />

-f- 8xy + 5tf = 9.<br />

2047. Inscribe <strong>in</strong> a given sphere a cyl<strong>in</strong>der hav<strong>in</strong>g the<br />

greatest<br />

total surface.<br />

2048. The beds of two rivers (<strong>in</strong> a certa<strong>in</strong> region) approximately<br />

represent a parabola y = x* and a straight l<strong>in</strong>e x y 2 = 0.<br />

It is required to connect these rivers by a straight canal of least<br />

length. Through what po<strong>in</strong>ts will it pass?<br />

2049. F<strong>in</strong>d the shortest distance from the po<strong>in</strong>t M(l, 2, 3)<br />

to the straight l<strong>in</strong>e<br />

x<br />

__ y 2<br />

~~ _<br />

1 3 ~~ 2 '<br />

2050*. The po<strong>in</strong>ts A and B are situated <strong>in</strong> different o<strong>pt</strong>ical<br />

media separated by a straight l<strong>in</strong>e (Fig. 72). The velocity of<br />

*1<br />

Fii

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