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B
B+D−1
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C
B+D+1
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D
B+D+2
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Solution
The correct option is DB+D−1 LHS=x2+1x4+x2+1;RHS=(Ax+B)(x2−x+1) +(Cx+D)(x2+x+1)x4+x2+1 LHS=RHS Comparing the co-efficients of powers of x. Co-efficients of x3 we get A+C=O−−(1) comparing x2 we get −A+B+C+D=1−−(2) from (2) re arrarainging terms we get A−C=B+D−1