#trigonometric_function__trigonometricfunction__circular_function  function of an angle expressed as a ratio of the sides of right-angled triangle containing the angle
  supertype:  mathematical_function__function  a mathematical relation such that each element of one set is associated with at least one element of another set
  subtype:  sine__sin  ratio of the opposite side to the hypotenuse
  subtype:  cosine__cos__co  ratio of the adjacent side to the hypotenuse
  subtype:  tangent.trigonometric_function__tan  ratio of the opposite to the adjacent side
  subtype:  cotangent__cotan  ratio of the adjacent to the opposite side
  subtype:  sec__secant  ratio of the hypotenuse to the adjacent side
  subtype:  cosecant__cosec  ratio of the hypotenuse to the opposite side

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