KöMaL 2022 C1734

A circle $k$ with diameter $AB$ has center $O$. We draw the circle $k_1$ with diameter $OB$, and the line parallel with $AB$ that touches the circle $k_1$ at point $C$. This line intersects the circle $k$ at points $D_1$ and $D_2$. Determine the angles $\angle COD_1$ and $\angle COD_2$ exactly.