Inverse trig functions

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Across
  1. 4. triangle, a triangle with a 90-degree angle
  2. 7. angle of depression, is the angle one has to look down horizontally to see something on a lower leve
  3. 8. the inverse of Cosine
  4. 9. the inverse of Sine
Down
  1. 1. the space/ opening between two lines or surfaces that intersect at a point, measured in degrees
  2. 2. a branch of mathematics that deals with the measurement, and relationship of points, lines, angles, and more
  3. 3. the inverse of Tangent
  4. 5. angle of elevation, is an angle between the horizontal plane and oblique line from the observer's eye to some object above his eye
  5. 6. simplifying a number to a nearby, easier-to-use value while keeping its original value close