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Q.

The angle between the pair of lines whose combined equation is 2x2+5xy+3y2+6x+7y+4=0 is cos-1k26 then k=

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a

1

b

2

c

4

d

5

answer is D.

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Detailed Solution

Cosθ=a+ba-b2+4h2 =51+25 =526Therefore, k=5
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