r_x
u+3

r_y_+/-
3+( 3^2 - (u-2*acos(-1)*3*sin(t))^2 )^.5
3-( 3^2 - (u-2*acos(-1)*3*sin(t))^2 )^.5

===========

r_x
-u-3

r_y_+/-
3+( 3^2 - (u-2*acos(-1)*3*sin(t))^2 )^.5
3-( 3^2 - (u-2*acos(-1)*3*sin(t))^2 )^.5
COLLIDING CYLINDERS
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