Locus of the point given by the equations x=2at1+t2,y=a(1−t2)1−t2(−1≤t≤1) is a
Straight line
Circle
Ellipse
Hyperbola
Here x = 2at1+t2 and y = a(1−t2)1+t2
Squaring and adding both, we get x2+y2=a2.