Contributed a targeted enhancement to the sympy/sympy repository by refining trigonometric simplifications within the Assumptions Module. The work focused on integrating refine_Pow into the refine_sin_cos function, which improved both the accuracy and efficiency of assumptions-based simplifications, particularly for expressions involving trigonometric functions. This change reduced the likelihood of edge-case mis-simplifications and enhanced the reliability of symbolic reasoning under mathematical assumptions. The implementation demonstrated proficiency in Python programming, mathematics, and symbolic computation, with a clear emphasis on optimizing code paths for performance. The update benefits downstream analytical workflows by providing more robust and efficient trigonometric simplification capabilities.