Verify That Each Equation Is an Identity $$\sec ^ { 4 } x - \tan 4 x = \sec ^ { 2 } x + \tan 2 x$$

question 42

Essay

Verify that each equation is an identity.
- $$\sec ^ { 4 } x - \tan 4 x = \sec ^ { 2 } x + \tan 2 x$$

---

Definitions:

Direct Labor

The wages and related benefits of employees who are directly involved in the production of goods or in providing services.

FIFO Method

A technique for inventory valuation and cost determination where goods first introduced into inventory are the first to be sold.

Process Costing System

An accounting method used for homogeneous products, where costs are assigned to processes or departments and averaged over the units produced.

Weighted Average Method

An inventory costing method that calculates the cost of goods sold and ending inventory based on the weighted average cost of all goods available for sale.