Simplify the Expression Algebraically $\cos ( 2 x + 4 y ) \cos ( 2 x - 4 y )$

question 13

Short Answer

Simplify the expression algebraically.
​ $\cos ( 2 x + 4 y ) \cos ( 2 x - 4 y )$ ​

---

Definitions:

Phototherapy

A treatment using light to reduce symptoms of certain medical conditions, including skin disorders and neonatal jaundice.

Antiretroviral Drugs

Medications used to treat HIV/AIDS by inhibiting the virus's ability to replicate within the host's body.

Viral Load

The quantity of virus present in a person's blood, often used to assess the severity of viral infections, including HIV.

CD4 Count

A measure of the number of CD4 T cells in a cubic millimeter of blood, used as an indicator of immune function in individuals, particularly those with HIV.