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The pair of tangents from (2,1) to the c...

The pair of tangents from (2,1) to the circle `x^(2)+y^(2)=1` is

A

`3y^(2)-4xy+16x+8y-20=0`

B

`3y^(2)+4xy+4x-2y-5=0`

C

`3x^(2)-4xy-16x-8y+20=0`

D

`3x^(2)-4xy-16x+8y-20=0`

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-CIRCLES-PRACTICE EXERCISE
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  3. The pair of tangents from (2,1) to the circle x^(2)+y^(2)=1 is

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  4. The midpoint of chord formed by the polar of (-9,2) w.r.t x^(2)+y^(2)=...

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  9. Angle between tangents at the ends chords of circle (x-1)^(2)+(y-2)^(2...

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  10. The circle x^(2)+y^(2)-4x-6y-12=0, x^(2)+y^(2)+6x-8y+21=0 are

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  11. The circle x^(2)+y^(2)2x+4y+4y=0,x^(2)+y^(2)+4x-2y+1=0 are

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  12. The number of common tangents to x^(2)+y^(2)=1, x^(2)+y^(2)-6x-8y+24=0...

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  13. The number of common tangents to x^(2)+y^(2)=4,(x-3)^(2)+(y-4)^(2)=9 i...

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  14. The internal cent re of similitude of two circles (x-2)^(2)+(y-3)^(2)=...

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  15. The external centre of similitude of the two circles x^(2)+y^(2)-2x-6y...

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  16. It is not possible to find the equation of a cicle I: If radius cent...

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  17. Read of the following two statements I: sqrt(3)x-y+4=0 is tangent to...

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  18. The number of parameters of the equation ax^(2)+ay^(2)+2fy+c=0 is

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  19. If the circles x^(2)+y^(2)=a^(2), x^(2)+y^(2)-6x-8y+9=0 touch external...

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  20. The condition that the circles x^(2)+y^(2)+2ax+c=0, x^(2)+y^(2)+2by+c=...

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