Assertion: trigonometric function | /r/AtLocation | initial side of a
Facets:
value: along the positive x-axis
type: LOCATION
Source sentences:
text: Trigonometric functions of an angle To define trigonometric functions for any angle A, the angle is placed in position on a rectangular coordinate system with the vertex of A at the origin and the initial side of A along the positive x-axis; r (positive)