KEAM 2013 Math Paper

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Question : 43 of 120

Marks: +1, -0

If

cos−1(

1−x2

1+x2

)+cos−1(

1−y2

1+y2

)=

π

2

,

where xy<1, then

x−y−xy=1
x−y+xy=1
x+y−xy=1
x+y+xy=1
y−x−xy=1

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