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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