The cosine of 1/x is a trigonometric function where x is in radians. As x becomes larger (closer to positive infinity), 1/x becomes infinitesimally small, causing oscillations in the cosine values.
Related terms
Trigonometric Functions: Functions like sine, cosine, tangent, etc., which relate angles of triangles to ratios between their sides.
Periodicity: Cosine (and sine) functions repeat themselves after covering specific intervals called periods.
Oscillation: The back-and-forth motion displayed by functions like cosine due to their repetitive nature.