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If cos^4 alpha +k and sin^4 alpha+k are ...

If `cos^4 alpha +k and sin^4 alpha+k` are the roots of `x^2+lambda(2 x+1)=0 and sin^2 alpha+1 and cos^2 alpha +1` are the roots of `x^2 +8 x+4=0,` then the sum of the possible values of `lambda` is

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