cos
definition and properties - see
Functions - Theory - Elementary functions - Trigonometric functions
as a sequence - intro in
Sequences - Theory - Introduction - Important Examples
, properties in
Sequences - Theory - Limit - Important Examples
, see also
this note
derivative - see
Derivatives - Theory - Introduction - Elementary derivatives
expansion - see
Series - Theory - in Series of functions - Taylor series
identities - see
Functions - Theory - Elementary functions - Trigonometric functions
integral of - see
Integrals - Theory - Methods of integration - Elementary integrals
and
Integrals - Methods Survey - Methods of integration - Trigonometric integrals
left-hand rule - see
this note