Use the Cofunction Identities to Evaluate the Expression Without Using

question 9

Multiple Choice

Use the cofunction identities to evaluate the expression without using a calculator. ​
Cos²35° + cos²50° + cos²40° + cos²55°
​

• A)-2
• B)1
• C)-1
• D)3
• E)2

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Definitions:

Economically Efficient

A state where resources are allocated in a way that maximizes the net benefit to society.

Market System

A financial system where investment, production, and distribution decisions are dictated by price signals resulting from the interplay of supply and demand forces.

Fundamental Question

Fundamental Question refers to the basic questions any economic system must answer, which include what to produce, how to produce, and for whom to produce.

Guiding Function

The role of prices in directing the allocation of resources and goods in an economy, ensuring resources are used where they are most valued.