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If the angle between the circles `x^(2) +y^(2) +4x - 5 = 0 and x^(2) +y^(2) +2lambda y- 4 = 0 "is" (pi)/(3), " then " lambda = `

A

`pm sqrt(5)`

B

`pm 2`

C

`pm sqrt(3)`

D

`pm sqrt(6)`

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The correct Answer is:
A
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