Determine Which of the Following Are Trigonometric Identities $\frac { \sin ( y ) - \sin ( x ) } { \cos ( y ) + \cos ( x ) } + \frac { \cos ( y ) - \cos ( x ) } { \sin ( y ) + \sin ( x ) } = 0$

question 55

Multiple Choice

Determine which of the following are trigonometric identities.
I. $\frac { \sin ( y ) - \sin ( x ) } { \cos ( y ) + \cos ( x ) } + \frac { \cos ( y ) - \cos ( x ) } { \sin ( y ) + \sin ( x ) } = 0$
II. $\frac { \sin ( y ) + \sin ( x ) } { \cos ( y ) + \cos ( x ) } + \frac { \cos ( y ) + \cos ( x ) } { \sin ( y ) + \sin ( x ) } = 1$
III. $\frac { \sin ( y ) + \cos ( x ) } { \sin ( y ) \cos ( x ) } = \sin ( x ) + \cos ( y )$

• A) I is the only identity.
• B) II and II are the only identities.
• C) I, II, and III are identities.
• D) I and III are the only identities.
• E) II is the only identity.

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Definitions:

Market Power

The ability of a firm to influence or control the price and output level in the market.

Interdependence

The mutual reliance between two or more groups or sectors, especially in an economic context, where the actions of one directly affects the others.

Market Demand Curve

A graphical depiction showing the quantity of a commodity that consumers in a market will purchase at various prices.

Marginal Cost

The price of generating one more unit of a product or service.