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(a^(2)-1)x^(2) + (a^(2) +5a+4)x+(a^(2) +...

`(a^(2)-1)x^(2) + (a^(2) +5a+4)x+(a^(2) + 4a+3)=0`. Find the value of a for which
(i) equation has two roots
(ii) Equation has one real root
(iii) It is an identity in x

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