Complete the Identity $\sin x ( \sin 2 x + \sin 4 x ) =$

question 94

Multiple Choice

Complete the identity.
- $\sin x ( \sin 2 x + \sin 4 x ) =$ ?

• A) \(\cos x ( \cos 2 x - \cos 4 x )\)
• B) \(\cos x ( \cos 2 x + \cos 4 x )\)
• C) \(\frac { 1 } { 2 } \cos x ( \cos 2 x - \cos 4 x )\)
• D) \(\frac { 1 } { 2 } \cos x ( \cos 2 x + \cos 4 x )\)

---

Definitions:

Commons Dilemma

A situation in which individuals' short-term selfish interests are in conflict with long-term group interests and common good.

Prisoner's Dilemma

A scenario in game theory in which two individuals acting in their own self-interest do not produce the optimal outcome for either party.

Ultimatum Game

A game in economic experiments where two players decide on how to divide a sum of money; the proposer suggests a division and the responder can either accept or reject it.

Entitativity

The degree to which a collection of people feels like a cohesive group.