Find the Exact Value of the Expression If θ = $f ( \theta ) = \cos \theta \quad$

question 158

Multiple Choice

Find the exact value of the expression if θ = 30°. Do not use a calculator.
- $f ( \theta ) = \cos \theta \quad$ Find $11 f ( \theta )$ .

• A) \(\frac { 11 \sqrt { 3 } } { 2 }\)
• B) \(- \frac { \sqrt { 3 } } { 2 }\)
• C) \(\frac { 11 } { 2 }\)
• D) \(- \frac { 1 } { 2 }\)

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Definitions:

AC Voltage

Alternating Current voltage, where the flow of electric charge periodically reverses direction, commonly used in power supply systems worldwide.

Encoder

A rotary device that transmits position information; a device that transmits a fixed number of pulses for each revolution.

Digital Signal

An electronic signal that represents data as a series of discrete values, typically used in digital electronics and communication.

DC

Direct Current, a type of electrical current where the flow of electric charge is in a constant direction, contrasted with alternating current (AC).