To view the source code for intrinsic functions in Fortran 90/95, such as sqrt, users can explore the libraries of open-source compilers like g95 and gfortran. While the compiler generates the code, the actual implementations of these functions are often based on complex mathematical algorithms and may not be straightforward to understand without a strong background in numerical analysis. For gfortran, users noted difficulty in locating the source code despite its open-source nature. Additionally, many intrinsic functions are implemented as hardware floating-point instructions, which may involve proprietary algorithms and internal tables for efficiency. Accessing this information can be challenging, as it is typically not publicly available.