How many tangents to the circle x2+y2=3 are there which are normal to the ellipse x29+y24=1
A
3
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B
2
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C
1
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D
\N
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Solution
The correct option is D \N Equation of normal at p(3cosθ,2sinθ) is 3xsecθ−2ycosecθ=5 5√9sec2θ+4cosec2θ=√3Butminimumvalueof9sec2θ+4cosec2θ=25∴nosuchθ−1exists
So the number of tangents to the circle x2+y2=3 which are normal to the ellipse x29+y24=1 is 0.