Use the Sum-To-Product Formulas to Find the Exact Value of the Given

question 17

Multiple Choice

Use the sum-to-product formulas to find the exact value of the given expression. ​​ $$\cos 150 ^ { \circ } + \cos 30 ^ { \circ }$$ ​

• A)​ \(\frac { - \sqrt { 3 } } { 2 }\)
• B)​1
• C)​ \(\frac { \sqrt { 3 } } { 2 }\)
• D)-1
• E)0

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Definitions:

Diminishing Marginal Returns

A principle that states as additional units of a variable input are added to fixed inputs, the additional output produced from each new unit eventually decreases.

Variable Resources

Inputs that change in quantity with levels of production, such as raw materials and labor.

Variable Cost

Costs that change in proportion to the level of goods or services that a business produces.

ATC

Average Total Cost, which is the sum of all production costs divided by the quantity of output produced.