12. The locus of the point
(a cosecα + b cotα,a cotα + b cosecα ) where
0<α< 2π is
1)x2 +y2 = a2 +b2
2) x2 + y2 =a2 -b2
3)x2 -y2 = a2 +b2
4) x2 - y2 = a2-b2
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