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MathNet 2006 — Part 04 Question 124

Math Olympiad Vault · MathNet 2006 — Part 04

Question 124

Two circles $\omega_1$ and $\omega_2$ intersect each other at two distinct points $A$ and $B$. The tangent line of the circle $\omega_1$ at the point $A$ and the tangent line of the circle $\omega_2$ at the point $B$ meet at point $C$. The first one of these two lines intersects the circle $\omega_2$ for the second time at point $T$ (distinct from $A$). A point $X$ (distinct from $A$ and $B$) belongs to the circle $\omega_1$, and the straight line $XA$ intersects the circle $\omega_2$ for the second time at point $Y$ (distinct from $A$). The straight lines $YB$ and $XC$ meet at point $Z$. Prove that $TZ$ is parallel to $XY$.