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If alpha,beta,gamma,delta are the roots...

If `alpha,beta,gamma,delta` are the roots of the equation `x^4-K x^3+K x^2+L x+m=0,w h e r eK ,L ,a n dM` are real numbers, then the minimum value of `alpha^2+beta^2+gamma^2+delta^2` is `0` b. `-1` c. `1` d. `2`

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