TS EAMCET 11-Sep-2020 Shift 1 Solved Paper

Section: Mathematics
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Question : 19 of 160
 
Marks: +1, -0
If
1
x4+x2+1
=
Az+B
x2+x+1
+
Cx+D
x2−x+1
, then Cos−1(A+B+C+D)=
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