   Chapter 10, Problem 56RE

Chapter
Section
Textbook Problem

Show that the angles between the polar axis and the asymptotes of the hyperbola r = ed/(1 − e cos θ), e > 1, are given by cos−1(±1/e).

To determine

To show: The angles between the polar axis and the asymptotes of the hyperbola r=ed1ecosθ with eccentricity e>1 and is given by cos1(±1e).

Explanation

For a conic with the eccentricity value of e greater than 1, then it is a hyperbola,

a2=e2d2(1e2)2 (1)

b2=e2d21e2 (2)

When the condition e>1 is true, then the expression 1e2<0 is true.

Rewrite the equation (1) and (2) as follows.

a2=e2d2(e21)2 (3)

b2=e2d2e21 (4)

Divide equation (4) by (3).

b2a2=e2d2e21e2d2(e21)2b2a2=(e21)2e21(ba)2=e21(ba)=±e21

Equation for asymptote is given as y=±bax

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