A pair of tangents are drawn from the origin to the circle ${x^2} + {y^2} + 20(x + y) + 20 = 0$. The equation of the pair of tangents is
A pair of tangents are drawn from the origin to the circle ${x^2} + {y^2} + 20(x + y) + 20 = 0$. The equation of the pair of tangents is
- A
${x^2} + {y^2} + 10xy = 0$
- B
${x^2} + {y^2} + 5xy = 0$
- C
$2{x^2} + 2{y^2} + 5xy = 0$
- D
$2{x^2} + 2{y^2} - 5xy = 0$
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- [IIT 1985]
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