Crossword puzzle

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Across
  1. 3. A line that a graph approaches but never touches
  2. 5. Half the distance between the maximum and minimum of a sinusoidal function
  3. 8. The reciprocal of cosine
  4. 9. The horizontal line running through the center of a sinusoidal graph
  5. 10. The horizontal length of one complete cycle of a periodic function
Down
  1. 1. Formula used to expand sin or cos of a sum or difference of two angles
  2. 2. The reciprocal of sine
  3. 4. The horizontal translation of a trig function
  4. 6. The inverse operation of exponentiation
  5. 7. A circle with radius 1 centered at the origin, used to define trig values