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Let α and β be two real roots of the equation (k + 1) tan 2 x – 2 . λ tan x = (1 – k), where k ( ≠ – 1) and λ are real numbers. If tan 2 ( α + β ) = 50, then a value of λ is :

1. 5
2. 10
3. 5 2
4. 10 2

Correct answer: 10

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