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In the curve represented parametrically by the equations `x=21ncott+1a n dy=tant+cott ,` A. tangent and normal intersect at the point (2,1) B. normal at `t=pi/4` is parallel to the y-axis. C. tangent at `t=pi/4` is parallel to the line `y=x` D. tangent at `t=pi/4` is parallel to the x-axis.

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