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Question

Show that angle between the two asymptotes of a hyperbola x2a2y2b2=1 is 2tan2ba (or) 2sec1(e).

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Solution

Asymptotes of given hyperbola are : y=±bax

slope of 1st asymptote b=is m1=ba
similarly m2=ba

Angle between asymptotes =tanθ=m1m21+m1m2

tanθ=2ba1b2a2

θ=2tan1(ba)

or θ=2sec1(e)

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