UPSC 2013 CDS 1 Math Paper

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Question : 45 of 100
 
Marks: +1, -0
If a2=‌
1+2‌sin‌θ‌cos‌θ
1−2‌sin‌θ‌cos‌θ
, then what is ‌
a+1
a−1
eq̣ual to?
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