We have two forces acting on the beam, one at the midpoint and one at the end. The deflection due to the first force P is given by:
\[ \delta_{BA1} = \frac{1}{2} - \frac{PL}{3EI} \left( \frac{L}{3} + 2\frac{L}{9} \right) + \frac{1}{2} - 2\frac{PL}{3EI} \left(
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