JEE MATHEMATICS MCQ: ELLIPSE

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Application +4 | -1

The line

3x + 5y = 15\sqrt 2

is a tangent to the ellipse

\frac{{{x^2}}}{{25}} + \frac{{{y^2}}}{9} = 1,

at a point whose eccentric angle is

View answer and explanation

Correct option: B

\frac{\pi }{4}

Option B (

\frac{\pi}{4}

) is correct because by comparing the given tangent equation with the parametric form of the tangent to the ellipse, we can find the eccentric angle.

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\frac{x^2}{144}+\frac{y^2}{81}=1

m

\mathrm{M}

\mathrm{mM}

P

\frac{{{x^2}}}{{25}} + \frac{{{y^2}}}{{16}} = 1

S

S'.

A

PSS',

A

A

B

(\sqrt{7}, 0)

(-\sqrt{7}, 0)

P

9 x^{2}+16 y^{2}=144

\mathrm{PA}+\mathrm{PB}

\frac{x^2}{a^2}+\frac{y^2}{b^2}=1

r

\frac{x^2}{25}+\frac{y^2}{16}=1

P

x=0

Q

R

Q

y=x

Q

R

N P

Q

P

O