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

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106 Extrema and the Geometric Applications of a Derivative [Ch. 3<br />

1022. xy=l at the po<strong>in</strong>t (1, 1).<br />

1023. ay* = x* at the po<strong>in</strong>t (a, a).<br />

Write the equations of the circles of curvature of the given<br />

curves at the <strong>in</strong>dicated po<strong>in</strong>ts:<br />

1024. y = x* Gjc+10 at the po<strong>in</strong>t (3, 1).<br />

1025. y = e* at the po<strong>in</strong>t (0, 1).<br />

F<strong>in</strong>d the evolutes of the curves:<br />

1026. y* = 2px (parabola).<br />

1027. J + g=l (ellipse).<br />

1028. Prove that the evolute of the cycloid<br />

x~a(t s<strong>in</strong>/), y = a(l cost)<br />

is a displaced cycloid.<br />

1029. Prove that the evolute of the logarithmic spiral<br />

is also a logarithmic spiral with the same pole.<br />

1030. Show that the curve (the <strong>in</strong>volute of a circle)<br />

r<br />

x = a (cos / + / s<strong>in</strong> /), #=-a(s<strong>in</strong> / /cos /)<br />

is the <strong>in</strong>volute of the circle ;c = acob/; // = asm/.

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