TS EAMCET 14-Sep-2020 Shift 2 Solved Paper

Section: Mathematics
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Question : 9 of 160
 
Marks: +1, -0
If a+
cosθ
2
+
cos2θ
4
+
cos3θ
8
+........
+
a−2cosθ
5+bcosθ
for some a,b∊R, then (a−b)2=
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