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Let cosθ,cosθ2 and cosθ4 are the roots of the equation x3+ax2+bx+c=0. If limθ→0[1+a+b+cθ6]=1k, then the value of k is

Answer» Let cosθ,cosθ2 and cosθ4 are the roots of the equation x3+ax2+bx+c=0. If limθ0[1+a+b+cθ6]=1k, then the value of k is


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