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Q)
The parametric equaions $x= \frac{2a(1-t^2)}{1+t^2}$, and $y = \frac{4at}{1+'t^2}$ represents a circle of radius is equal to :
( A ) $2a$
( B ) $\frac{9}{2}$
( C ) $4a$
( D ) $a$
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