Trigonometry

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Across
  1. 3. the study of numbers
  2. 6. never ending
  3. 7. sine, cosine, tangent
  4. 8. tangent of pi/2 radians
  5. 9. a quarter of the unit circle
  6. 11. a measure of rotations
Down
  1. 1. the study of periodic functions
  2. 2. horizontal distance
  3. 4. TOA
  4. 5. height
  5. 10. a circle with a radius of one