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It's been a while since I took calculus, but I seem to remember that a TI-89 calculator could show its steps when solving a problem.

• voxic11 5y ago
  Yeah I also had a TI-89 and you could directly type in most calc problem and get a great step by step answer. The symbolic solver on that thing was great.
• jdmichal 5y ago
  Yep. We all had either TI-89 or -92. I used it to check myself after doing practice problems.