Verify That Each Equation Is an Identity $$\cos ( 4 u ) = 2 \cos ^ { 2 } ( 2 u ) - 1$$

question 207

Essay

Verify that each equation is an identity.
- $$\cos ( 4 u ) = 2 \cos ^ { 2 } ( 2 u ) - 1$$

---

Definitions:

Cancer

A broad group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body.

Fractures

Breaks or cracks in bones, often resulting from injury, that can vary in severity and type.

Low-Dose X-Ray

An imaging technique that uses a small amount of radiation to capture pictures of the inside of the body.

Breast

A pair of glands on the chest of female mammals that secrete milk for feeding their young.