Gujarati
10-2. Parabola, Ellipse, Hyperbola
hard

दीर्घवृत्त  $3{x^2} + 2{y^2} = 5$ पर बिन्दु  $(1, 2)$ से खींची गयीं स्पर्श रेखाओं के बीच कोण है    

A

${\tan ^{ - 1}}\left( {\frac{{12}}{5}} \right)$

B

${\tan ^{ - 1}}(6\sqrt 5 )$

C

${\tan ^{ - 1}}\left( {\frac{{12}}{{\sqrt 5 }}} \right)$

D

${\tan ^{ - 1}}(12\sqrt 5 )$

Solution

(c) $S{S_1} = {T^2}$

$\tan \theta  = 2\frac{{\sqrt {{h^2} – ab} }}{{a + b}},$

$a = 9$, $b =  – 4$ व $h =  – 12$.

Standard 11
Mathematics

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