math trigonometry

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