For math-heavy PDFs: Use OCR software (like Mathpix or Snip) to convert PDF equations into LaTeX or MathML. Then, use TI-Nspire's built-in mathprint or manually enter them into the CAS environment.
Based on this review, we recommend the PDF to TNS file converter to: Pdf To Tns File Converter
: A command-line tool often used for converting Lua and Python scripts to TNS documents, which can also handle XML formatted problems. For math-heavy PDFs: Use OCR software (like Mathpix