Mathematics

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Across
  1. 2. Greatest solution to x(x - 7) = -12
  2. 9. 10!/8!
  3. 10. Second derivative of position
  4. 11. Angles whose sum is 90°
  5. 14. Sine and cosecant, for one
  6. 16. Number system with only digits 0, 1, and 2
  7. 17. f, where (tan x)² + 1 = f(x)²
  8. 19. Euclid's 5th one was controversial
  9. 20. Another word for slope
  10. 21. s³ to a cube
Down
  1. 1. Rate of change at a point
  2. 3. The polynomial 3x(x - 2) is one
  3. 4. Numbers in the form a + bi
  4. 5. Lines whose slope multiply to -1
  5. 6. 2, 3, 5, 7, 11...
  6. 7. Quantity with magnitude and direction
  7. 8. Discoverer of e^(iπ) = -1
  8. 11. Adjacent over opposite
  9. 12. Like a grid of numbers
  10. 13. ½bh to a triangle
  11. 15. tan(45°)
  12. 18. The graph of y=x²