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If `alpha,beta,gamma,sigma` are the roots of the equation `x^4+4x^3-6x^3+7x-9=0,` then he value of `(1+alpha^2)(1+beta^2)(1+gamma^2)(1+sigma^2)` is `9

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If `alpha,beta,gamma,sigma` are the roots of the equation `x^4+4x^3-6x^3+7x-9=0,` then he value of `(1+alpha^2)(1+beta^2)(1+gamma^2)(1+sigma^2)` is `9` b. `11` c. `13` d. 5
A. 9
B. 11
C. 13
D. 15
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Correct Answer - C
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