Evaluate the Trigonometric Function at the Quadrantal Angle, or State $\cos \pi$

question 26

Multiple Choice

Evaluate the trigonometric function at the quadrantal angle, or state that the expression is undefined.
- $\cos \pi$

• A) \(- 1\)
• B) undefined
• C) 0
• D) 1

---

Definitions:

Smartphones

Advanced mobile phones equipped with internet access and a wide variety of applications, functioning as portable, digital multi-tools.

Secondary Education

The stage of education following primary education, typically including high school or equivalent, focusing on preparation for higher education or vocational training.

Tertiary Education

Higher education programs, including universities and colleges, following the completion of secondary education, often leading to an academic degree.

Quaternary Education

Education that follows after tertiary education, including further academic or professional study, research, and training.