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Question

The number of tangents which can be drawn from the point (–1,2) to the circle x2+y2+2x−4y+4=0 is

A
1
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B
2
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C
3
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Solution

We'll check the position of the point through S1.
S1 = (1)2+(2)2+2(1)4(2)+4=0
= -1
Since it's negative the point lies within the circle, and hence no tangent can be drawn.

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