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Given that tanA and tanB are the roots ...

Given that tanA and tanB are the roots of `x^2 - px + 2 = 0` then find the value of `Cos^2( A + B ) `
( A ) `1/(p^2 - 1 )`
( B ) `p^2/( p^2 + 1 )`
( C ) `1/(p^2 + 1 )`
( D ) None

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