math trigonometry

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Across
  1. 3. a straight line that intersects a curve at two or more points
  2. 4. function/function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle
  3. 6. the inverse function of the cosine
  4. 7. ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
  5. 9. ratio of the hypotenuse to the opposite side of a right-angled triangle
  6. 10. ratio of the adjacent to the opposite side of a right-angled triangle
  7. 12. what something is used for
Down
  1. 1. the space between two lines or planes that intersect
  2. 2. the inverse function of the tangent
  3. 5. of or relating to or according to the principles of trigonometry
  4. 8. a line that touches a curve at only one point
  5. 11. the inverse function of the sine