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[" 6.If "cos^(4)alpha+k" and "sin^(4)alp...

[" 6.If "cos^(4)alpha+k" and "sin^(4)alpha+k" are the roots of "x^(2)+lambda(2x+1)],[=0" and "sin^(2)alpha+1" and "cos^(2)alpha+1" are the roots of "x^(2)+8x],[+4=0," then the sum of the possible values of "lambda" is "],[[" (a) "2," (b) "-1," (c) "1," (d) "3]]

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