Verify the Identity $$\cos 4 \theta = 2 \cos ^ { 2 } ( 2 \theta ) - 1$$

question 42

Essay

Verify the identity.
- $$\cos 4 \theta = 2 \cos ^ { 2 } ( 2 \theta ) - 1$$

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Definitions:

Direct Labor Hours

The total hours worked by employees who are directly involved in the production process of goods or services.

PVC Fencing

A fencing material made from polyvinyl chloride, known for its durability, weather resistance, and low maintenance requirements.

Plantwide Overhead Rate

A unified rate employed across the entire manufacturing facility to allocate overhead expenses to products.

Machine Hours

A measure of the amount of time that machinery is operating and being used for production within a given period.