Maths Puzzle

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Across
  1. 4. Evaluate 2⁶
  2. 6. Minimum value of y = x² - 6x + 5
  3. 8. Acute angle θ in degrees where sin θ = 1/2
  4. 9. Set of all possible x-values of a function
  5. 10. Evaluate 4!
  6. 12. Exact value of tan 45°
  7. 15. Sum to infinity of 8 + 4 + 2 + 1 + ...
  8. 18. Exact area of a circle with radius 3
  9. 20. Evaluate log₂ 256
  10. 21. If f(x) = x³ + 2x, find f′(2)
  11. 23. Hypotenuse of a right-angled triangle with shorter sides 5 and 12
  12. 24. Positive root of x² - 3x - 10 = 0
  13. 25. Number of ways to choose 3 items from 6 (⁶C₃)
  14. 27. Unit of angle where 180° equals π
Down
  1. 1. Turning point of a parabola
  2. 2. Line that touches a curve at exactly one point
  3. 3. Irrational root, such as √2, that cannot be simplified to a whole number
  4. 5. Rise over run of a straight line
  5. 7. Median of 3, 9, 4, 7, 12, 5
  6. 10. 10th term of the arithmetic sequence 2, 5, 8, ...
  7. 11. Sum of the first 5 terms of 3, 7, 11, ...
  8. 13. Evaluate 27^(4/3)
  9. 14. Probability of getting two heads when a fair coin is flipped twice
  10. 16. Discriminant of 2x² - 3x - 2
  11. 17. Line that a curve approaches but never touches, such as x = 0 for y = 1/x
  12. 19. Shape of the graph of y = ax² + bx + c
  13. 22. Solve 3x - 5 = 16
  14. 26. Find x if x + y = 15 and x - y = 5