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If `(a^2-1)x^2+(a-1)x+a^2-4a+3=0` is identity in `x` , then find the value of `a` .

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If `(a^2-1)x^2+(a-1)x+a^2-4a+3=0` is identity in `x` , then find the value of `a` .
A. `-1`
B. `1`
C. `3`
D. `-1,1,3`
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Correct Answer - B
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