Trigonometric Crossword Puzzle

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Across
  1. 1. 180/π is in
  2. 3. 1/sinx equals
  3. 4. This math rap song is a parody of the song
  4. 5. 180°, 180/π, and π/180 are all
  5. 9. If you square two identities and have the number one involved that means it's a
  6. 10. sinx/cosx equals
  7. 12. Radian equals what in angular measure
  8. 13. 1/secx equals
  9. 14. Degree equals what in angular measure
  10. 15. The branch of mathematics that studies relationships involving lengths and angles of triangles is
  11. 16. what plus cos²x equals one
  12. 17. π/180 is in
  13. 18. The first five words that begin the math rap song are
  14. 19. one plus what equals csc²x
  15. 21. 1/cosx equals
  16. 22. One plus cot²x equals
Down
  1. 2. putting one over an identity means it's a
  2. 6. tan²x plus what equals sec²x
  3. 7. Pie radians equals
  4. 8. 180°, 180/π, and π/180 are all
  5. 11. tanx and cotx are the only two
  6. 13. cosx/sinx equals
  7. 20. One over cscx equals