Answer:
Let L.H.S.
= 
Let
1 = Ax + (x
+ 1)+ B(x +1) + Cx2
x
= 0 1 = B
x
=?1 1 = C
x
=1 1 = 2A + 2B
+ C
1 = 2A + 2
+ 1
A = ?1
Hence
the result.
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