Express as a Sum or Difference $\sin 7 t \sin 2 t$

question 3

Multiple Choice

Express as a sum or difference. $\sin 7 t \sin 2 t$

• A) \(\cos ( 5 t ) - \cos ( 9 t )\)
• B) \(\frac { 1 } { 2 } \cos ( 6 t ) - \frac { 1 } { 2 } \cos ( 10 t )\)
• C) \(\sin ( 5 t ) - \sin ( 9 t )\)
• D) \(\frac { 1 } { 2 } \cos ( 5 t ) - \frac { 1 } { 2 } \cos ( 9 t )\)
• E) \(\frac { 1 } { 2 } \sin ( 5 t ) - \frac { 1 } { 2 } \sin ( 9 t )\)

---

Definitions:

First-In, First-Out Method

An inventory valuation method where goods purchased or manufactured first are sold or used first.

Equivalent Units

A concept in process costing that converts partially completed units into a number of fully completed output units.

Conversion Costs

Costs incurred to convert raw materials into finished goods, including both direct labor and manufacturing overhead.

Materials Costs

The expenses related to the basic materials required for manufacturing products.