# Worked example: cosine function from power series (K-A)

**Course:**Maclaurin series of e, sin(x), and cos(x) (K-A)**Discipline:**Basic and Health Sciences**Institute:**Khan Academy**Instructor(s):****Level:**Undergraduate

**Course:**Maclaurin series of e, sin(x), and cos(x) (K-A)**Discipline:**Basic and Health Sciences**Institute:**Khan Academy**Instructor(s):****Level:**Undergraduate