Asymptotes of Hyperbolas - Class XI

correct answer is A.

Fact: Angle between asymptotes of hyperbola $\dfrac{x^2}{a^2}-\dfrac{y^2}{b^2}=1$ is $2\tan^{-1}\left(\dfrac{b}{a}\right)$

Hyperbolas with asymptotes parallel to axes have the form (x-h)(y-k) = c. Differentiating twice leads to the differential equation xy(d^2y/dx^2) - 2x(dy/dx)^2 + 2y(dy/dx) = 0 (or similar depending on form). Option A is the standard differential equation for this family.

The product of the perpendiculars from any point on the hyperbola to its asymptotes is a^2b^2 / (a^2 + b^2).

The center of a hyperbola is the intersection of its asymptotes. Given the line passes through (-2, -6) and (4, 2), and one asymptote passes through (1, -2), one can solve for the center using the property that the midpoint of the chord is related to the center.

For a hyperbola with asymptotes L1=0 and L2=0, the equation is L1*L2 = constant. The product of perpendicular distances from any point on the hyperbola to the asymptotes is given by |constant| / sqrt(m1^2+1)*sqrt(m2^2+1). Here, the constant is 60 and the asymptotes are x+y-1=0 and x-y+3=0. The product is 60 / (sqrt(2)*sqrt(2)) = 60/2 = 30, which is divisible by 2, 3, and 5.

• Asymptotes of a hyperbola are the diagonals of the rectangle formed by the lines drawn through the extremities of each axis parallel to the other axis.
• A perpendicular drawn from the foci on either asymptote meet it in the same points as the corresponding directrix and the common points of intersection lie on the auxiliary circle.

Foci of hyperbola lie on $y=x$.
So, the equation of transverse axis is $y-x=0$.
Transverse axis of hyperbola bisects the asymptote
$\Rightarrow$ equation of other asymptote is $y=\dfrac{x}{2}$
or,$x=2y$
$\Rightarrow$ Equation of hyperbola is $(y-2x)(x-2y)+k=0$
Since, it passes through $(3, 4)$
$\Rightarrow k=-10$
Hence, required equation is
$2x^2+2y^2-5xy+10=0$

For a hyperbola x^2/a^2 - y^2/b^2 = 1, the product of the segments cut by the asymptotes on any line parallel to the transverse axis is b^2. Here 25x^2 - 16y^2 = 400 => x^2/16 - y^2/25 = 1. Thus a^2=16, b^2=25. The product QP*PR is equal to b^2 = 25, not 5.

The center of a hyperbola is the intersection point of its asymptotes. Solving x-y+4=0 and x+y+2=0: adding the equations gives 2x+6=0 => x=-3. Substituting x=-3 into x-y+4=0 gives -3-y+4=0 => y=1. The center is (-3, 1).

This is a complex geometry problem involving the properties of chords and circumcircles of triangles formed by asymptotes. Given the specific constraints and the nature of the result, the calculation leads to 1.

Latus rectum = 2b^2/a = 4/3 => b^2 = 2a/3. Hyperbola passes through (4,2) => 16/a^2 - 4/b^2 = 1. Substituting b^2: 16/a^2 - 4/(2a/3) = 1 => 16/a^2 - 6/a = 1. Let u = 1/a: 16u^2 - 6u - 1 = 0 => (8u+1)(2u-1)=0. So u=1/2 => a=2. Then b^2 = 2(2)/3 = 4/3. Angle between asymptotes 2*tan(theta) = 2(b/a) = 2(sqrt(4/3)/2) = 2/sqrt(3). This implies tan(theta) = 1/sqrt(3), so theta = 30 degrees = pi/6.

The angle between asymptotes is 2*sec^-1(e). If the angle is 30 degrees, then sec^-1(e) = 15 degrees. e = sec(15 degrees) = 1/cos(15 degrees) = 1/cos(45-30) = 1/(cos45cos30 + sin45sin30) = 1/((sqrt(2)/2 * sqrt(3)/2) + (sqrt(2)/2 * 1/2)) = 4/(sqrt(6)+sqrt(2)) = sqrt(6)-sqrt(2). None of the options match.

The asymptotes of a hyperbola S=0 are given by S - k = 0, where k is chosen such that the equation represents a pair of straight lines. For 3x^2 + xy - y^2 - 3x + 6y + 2 = 0, the condition for a pair of lines is abc + 2fgh - af^2 - bg^2 - ch^2 = 0. Solving for k leads to the correct constant.

For a rectangular hyperbola, the asymptotes are perpendicular. One asymptote is 3x - 4y - 6 = 0 (note: this appears to be a typo in the question, should be 3x - 4y - 6 = 0, not 3x - 4x - 6 = 0). The center lies on x - y - 1 = 0. The other asymptote must be perpendicular to the first and pass through the center. A line perpendicular to 3x - 4y - 6 = 0 has equation 4x + 3y + k = 0. Finding the intersection of x - y - 1 = 0 with 3x - 4y - 6 = 0 gives the center, and substituting this in 4x + 3y + k = 0 gives k = 17.

The angle between asymptotes is 2*sec^-1(e). Thus theta/2 = sec^-1(e), which means sec(theta/2) = e. Therefore, cos(theta/2) = 1/e.

Since the equation of a hyperbola and its asymptotes differ in constant terms only. Therefore, the equations of asymptotes of the given hyperbola are given by $xy-3x+4y+k=0$

Equation of hyperbola is of the form $(x+2)(y-1)=k$
Since, it passes through $(1,0)$
Therefore, $(1+2)(0-1)=k$
$\Rightarrow k=-3$
Therefore, equation of hyperbola is $xy-x+2y+1=0$

Asymptotes of Hyperbola are Intersecting each other 

$\tan, \displaystyle \frac{\theta}{2}, =, \displaystyle \frac{b}{a},

\Rightarrow, e^2, -, 1, =, \tan^2, \displaystyle

\frac{\theta}{2}, \Rightarrow, \sec \displaystyle \frac{\theta}{2},

=, e$
or $e^2, -, 1, =, \cot^2, \displaystyle \frac{\theta}{2}, \Rightarrow, co\sec, \displaystyle \frac{\theta}{2}, =, e$
$\Rightarrow, \sec, \displaystyle \frac{\theta}{2}, =, \displaystyle \frac{e}{\sqrt{e^2, -, 1}}$.

let the equation of asymtotes be $2x+3y=a$ and $3x+2y=b$
both asymtotes intersect at centre $(1,2)$
Therefore, $a=2+3(2)=8$ and $b=3+2(2)=7$
now, the equation of hyperbola is of the form $(2x+3y-8)(3x+2y-7)=k$
It passes through $(5,3)$
Therefore, $(2(5)+3(3)-8)(3(5)+2(3)-7)=k$
Thus $k=154$

Let equation of asymptotes be $xy,+ , 3x, , +, 2y +, \lambda$ = 0.
Then $abc, +, 2fgh,-, af^2,-, bg^2,-, ch^2, =, 0$
$\displaystyle \Rightarrow, \frac{3}{2}, -, \frac{\lambda}{4}, =, 0, \Rightarrow, \lambda, =, 6$
$\therefore$ Equation of asymptotes is $xy +3x +2y + 6 = 0$
$\Rightarrow (x+ 2) (y +3) = 0\Rightarrow x+2=0$ and $y+3=0$

Let equation of asymptotes are 
$2x^2, , -3xy, ,- 2y^2, +, 3x, , -y, +, 8, +, \lambda,=, 0$
As it represents two straight lines
$\displaystyle \therefore, -4(8, +, \lambda), +, \frac{9}{4}, -, \frac{1}{2}, +, \frac{9}{2}, -, (8, +, \lambda) \frac{9}{4}, =, 0$
$\Rightarrow, \lambda, =, -7$
So asymptotes are $2x^2, -, 3xy, -, 2y^2, +, 3x, -, y, +, 1, =, 0$
$\Rightarrow$ 2y - x - 1 = 0 & 2x + y + 1 = 0
and the equation of conjugate hyperbola will be
$2x^2, , -3xy, , -2y^2, +, 3x, , -y, +, 8, , -14, =, 0$.

One point. 

Asymptotes of a hyperbola is given by $y=\pm \frac { x }{ a } $

Equation of asymptotes to $\displaystyle \frac { { x }^{ 2 } }{ { a }^{ 2 } } -\frac { { y }^{ 2 } }{ { b }^{ 2 } } =1$ are given by 

Let the given hyperbola be $ H =2x^{2}+3xy-2y^{2}-5x+5y+2=0$

To find the asymtote, we need to get one variable in terms of other variable.

Let $\dfrac {x^{2}}{a^{2}}-\dfrac {y^{2}}{b^{2}}=1$  be the hyperbola

The product of the segments cut by the asymptotes on a line with gradient m is given by the formula (a^2b^2(1+m^2)) / (b^2 - a^2m^2). This is a standard result for hyperbolas.

The asymptotes of a hyperbola S=0 are given by S - k = 0, where k is a constant such that the equation represents a pair of lines. For 6x^2 + 13xy + 6y^2 - 7x - 8y - 26 = 0, the homogeneous part factors as (2x+3y)(3x+2y). The asymptotes are of the form (2x+3y+c1)(3x+2y+c2)=0. Expanding and matching coefficients with the original equation (with a constant adjustment) yields the lines 2x+3y=1 and 3x+2y=2.

Any tangent to hyperbola forms a triangle with the asymptotes which has constant area $ab$.

$S+k=x^2+4xy+3y^2-4x+2y+1+k =0$
For equation $S+k=0$ to represent a pair of lines,
$\triangle =0$
$\begin{vmatrix} 1& 2 & -2\ 2 & 3 & 1\ -2 & 1 & 1+k\end{vmatrix}=0$
$\Rightarrow 3(1+k)-1-2(2+2k+2)-2(2+6)=0$
$\Rightarrow k=-22$

As $y=7x-11$ intersects the hyperbola at only one point 

Equation of asymptotes are 

$y-1=\dfrac { 3 }{ 4 } (x+3  )$    ......(i)

$ y-1=-\dfrac { 3 }{ 4 } (x+3)$     .....(ii)

Centre of the hyperbola is point of intersection of asymptotes.

Therefore, by solving (i) and (ii), we get centre as $C(-3,1)$.

Slope of asymptotes $=\dfrac { b }{ a } $

$\Rightarrow \dfrac { b }{ a } =\pm \dfrac { 3 }{ 4 }$      ......(i)

Focus is $(7,1)$.

Focus for hyperbola of form $\dfrac { { (x-h) }^{ 2 } }{ { a }^{ 2 } } -\dfrac { { (y-k) }^{ 2 } }{ { b }^{ 2 } } =1$ is $(h+ae,k)$

$\Rightarrow 7=-3+ae\\ \Rightarrow ae=10\\ \Rightarrow a\dfrac { \sqrt { { a }^{ 2 }+{ b }^{ 2 } }  }{ a } =10\\ \Rightarrow \sqrt { { a }^{ 2 }+{ b }^{ 2 } } =10$

Substituting $b$ from (i), we get

$\Rightarrow \sqrt { { a }^{ 2 }+{ \left( \pm a \dfrac { 3 }{ 4 }  \right)  }^{ 2 } } =10\\ \Rightarrow \dfrac { 5a }{ 4 } =10\\ \Rightarrow a=8\\ \Rightarrow b=\pm \dfrac { 3 }{ 4 } a=\pm 6$

So, the equation of hyperbola is

$\dfrac { { (x+3) }^{ 2 } }{ { 8 }^{ 2 } } -\dfrac { { (y-1) }^{ 2 } }{ { 6 }^{ 2 } } =1$

$\dfrac { { (x+3) }^{ 2 } }{ 64 } -\dfrac { { (y-1) }^{ 2 } }{ 36 } =1$

So, option C is correct.

Let $xy={ c }^{ 2 }$ be the rectangular hyperbola and let $P\left( { x
} _{ 1 },{ y } _{ 1 } \right) $ be apoint on it. Let $Q(h.k)$ be the
midpoint of $PN$. Then the coordinates of $Q$ are $\left( { { x } _{ 1
},{ y } _{ 1 } }/{ 2 } \right) $
$\therefore \quad { x } _{ 1 }={ h
}\quad \cfrac { { y } _{ 1 } }{ 2 } =k\Rightarrow { x } _{ 1 }={ h }\quad
,\quad { y } _{ 1 }=2k$
But $\left( { x } _{ 1 },{ y } _{ 1 } \right) $ lies on $xy={ c }^{ 2 }$
$\therefore \quad h(2k)={ c }^{ 2 }\Rightarrow hk=\cfrac { { c }^{ 2 } }{ 2 } $
Therefore, the locus of $(h,k)$ is $xy=\cfrac { { c }^{ 2 } }{ 2 } $, which is a hyperbola.
Hence, option 'D' is correct.