Linear algebra symbols

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Across
  1. 3. {}
  2. 6. |x|
  3. 8. (f•g)
  4. 9. []
  5. 10. x!
Down
  1. 1. ()
  2. 2. x
  3. 4. f(x)
  4. 5. (a,b)
  5. 7. ≈