KCET 2009 Math Solved Paper

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Question : 29 of 61
 
Marks: +1, -0
If |
1+sin‌2θcos2θ4sin‌2θ
sin‌2θ1+cos2θ4sin‌2θ
sin‌2θcos2θ4sin‌2θ−1
|
=0
and 0<θ<‌
Ï€
2
, then cos‌4‌θ=
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