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

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Sec. 5]_Differential of an Arc. Curvature_105<br />

996. x 2 / 8<br />

2 / = -f t/ a 2 /'<br />

(astroid).<br />

997. y = acosh (catenary).<br />

998. x = a(ts\nt)\ y = a(lcost) (cycloid).<br />

999. x = acos*t, y = asm*t (astroid).<br />

F<strong>in</strong>d the differential of the arc, and also the cos<strong>in</strong>e or s<strong>in</strong>e<br />

of the angle formed by the radius vector and the tangent to each<br />

of the follow<strong>in</strong>g curves:<br />

1000. r^atp (spiral of Archimedes).<br />

1001. r = (hyperbolic spiral).<br />

1002. r = asec*-|- (parabola).<br />

1003. r = acos*- (cardioid).<br />

1004.<br />

1005.<br />

r=za.v (logarithmic spiral).<br />

r a = a 2<br />

cos2q) (lemniscate).<br />

Compute the curvature of the given curves at the <strong>in</strong>dicated<br />

po<strong>in</strong>ts:<br />

1006. y = x* 4x* ISA' 2<br />

equal<br />

at the coord<strong>in</strong>ate orig<strong>in</strong>.<br />

1007. x* + xy + y* = 3 at the po<strong>in</strong>t (1, 1).<br />

1008. + =1 at the vertices A (a, 0) and 5(0, b).<br />

1009. * = = /*, *' at f/ the po<strong>in</strong>t (1, 1).<br />

1010. r 2 = 2a 2<br />

eos2q> at the vertices cp = and =

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