Find the Exact Value of the Trigonometric Function $\cos \left( \frac { \pi } { 4 } \right)$

question 227

Multiple Choice

Find the exact value of the trigonometric function. Do not use a calculator or tables.
- $\cos \left( \frac { \pi } { 4 } \right)$

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

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