In a triangle

we have

A circle which is internally tangent with the circumscribed circle of the triangle is also tangent to the sides

in the points

respectively

Prove that the midpoint of

is the center of the inscribed circle of the triangle
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In a triangle $ABC$ we have $AB = AC.$ A circle which is internally tangent with the circumscribed circle of the triangle is also tangent to the sides $AB, AC$ in the points $P,$ respectively $Q.$ Prove that the midpoint of $PQ$ is the center of the inscribed circle of the triangle $ABC.$