Question

Which of the following statements best describes the domain of the functions cosine and arcos?

A. Cosine domain is all real numbers; Arccos domain is all real numbers.
B. Cosine domain is restricted; Arccos domain is all real numbers.
C. Cosine domain is all real numbers; Arccos domain is restricted.
D. Cosine domain is restricted; Arccos domain is restricted.

Answer 1

C. Cosine domain is all real numbers; Arc(cos) domain is restricted. Domain of arc(cos) is [-1,1].