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Q.

Length of chord of contact of point (4,4)  with respect to the circle x2+y2−2x−2y−7=0  is:

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a

32

b

6

c

3

d

32

answer is B.

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Detailed Solution

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PT=16+16−8−8−7=3⇒   TT'=2BT= 2.3 cos45°=32

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