Math.

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Across
  1. 4. - the kind of math
  2. 7. - the kind of math
  3. 8. - to work
  4. 9. - music
Down
  1. 1. - attractive
  2. 2. - numbers divided by each other
  3. 3. - difference
  4. 5. - something another, not usual
  5. 6. - of face
  6. 7. - something what we get