Prose
For the infamous linear algebra problems (Chapter 4: linear transformations, determinants), the manual sometimes says "trivial" – it’s not. Look up a companion like Friedberg or Strang for those.
✓ Verify your epsilon-delta choices. ✓ Check if your chosen parameterization for a surface integral matches the manual’s (often multiple are correct). ✓ Catch sign errors in curl/divergence calculations. Tom M Apostol Calculus Volume 2 Solution Manual
Worth hunting down a PDF (if out of print for your edition) or borrowing from a math department library. But remember – Apostol designed the book so you struggle productively. The manual is a flashlight, not a bulldozer. For the infamous linear algebra problems (Chapter 4: