TS EAMCET 9-Sep-2020 Shift 1 Solved Paper

Section: Mathematics
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Question : 22 of 160
 
Marks: +1, -0
If
cos(θ1+θ2)
cos(θ1−θ2)
+
cos(θ3−θ4)
cos(θ3+θ4)
=0
, then cotθ1·cotθ2·cotθ3·cotθ4=
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