LeMarr's Trigonometry Puzzle

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Across
  1. 1. the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)
  2. 6. the inverse function of the cosine; the angle that has a cosine equal to a given number
  3. 8. function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle
  4. 9. of or relating to or according to the principles of trigonometry
  5. 10. ratio of the adjacent to the opposite side of a right-angled triangle
  6. 12. a straight line that intersects a curve at two or more points
  7. 13. the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians
  8. 14. ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
  9. 15. a straight line or plane that touches a curve or curved surface at a point but does not intersect it at that point
Down
  1. 2. the inverse function of the sine; the angle that has a sine equal to a given number
  2. 3. a straight line that intersects a curve at two or more points
  3. 4. ratio of the hypotenuse to the opposite side of a right-angled triangle
  4. 5. what something is used for
  5. 6. the inverse function of the tangent; the angle that has a tangent equal to a given number
  6. 7. a function obtained by expressing the dependent variable of one function as the independent variable of another; f and g are inverse functions if f(x)=y and g(y)=x
  7. 11. having a common boundary or edge; abutting; touching