Math crossword

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Across
  1. 3. a relation between a set of inputs and a set of permissible outputs
  2. 5. brother of sine
  3. 6. the longest of a right-angled triangle
  4. 8. d=15,934 find the area of a circle
  5. 10. gathering lines
  6. 11. theme that changed our perception about the digit 0
Down
  1. 1. that give us a n/0
  2. 2. a branch of mathematics concerned with relative position of figures
  3. 4. thing that helps to us in difficult situations
  4. 7. He came up with us easy formula, but we decide on the discriminant
  5. 9. Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.