Developed a plaintext Chebyshev evaluation function for the openfheorg/openfhe-development repository, enabling numerical approximation workflows on cleartext data that align with existing ciphertext processing. The work involved designing and implementing EvalChebyshevFunctionPtxt in C++, ensuring its interface and behavior mirrored the established ciphertext function for consistency and ease of onboarding. Comprehensive test coverage and usage examples were provided to support validation and integration. By focusing on homomorphic encryption concepts and numerical methods, the contribution streamlined testing and validation for both encrypted and unencrypted data paths, enhancing the maintainability and extensibility of the codebase without introducing new bugs during the development period.