Use a Sum or Difference Identity to Find the Exact $\cos 36 ^ { \circ } \cos 24 ^ { \circ } - \sin 36 ^ { \circ } \sin 24 ^ { \circ }$

question 47

Multiple Choice

Use a sum or difference identity to find the exact value.
- $\cos 36 ^ { \circ } \cos 24 ^ { \circ } - \sin 36 ^ { \circ } \sin 24 ^ { \circ }$

• A) \(\frac { \sqrt { 3 } } { 2 }\)
• B) \(\frac { \sqrt { 2 } } { 2 }\)
• C) 1
• D) \(\frac { 1 } { 2 }\)

---

Definitions:

Freely Available

Something that can be accessed or obtained without restrictions or payment, typically offered openly to the general public.

Government Regulations

laws and rules established by governmental agencies aimed at controlling the way businesses can operate within a society.

Public Good

A good that is non-excludable and non-rivalrous, meaning individuals cannot be effectively excluded from use and where use by one individual does not reduce availability to others.

Police Services

Essential public services provided by the police, focused on maintaining public order, enforcing the law, and protecting citizens and their property.