Find the Exact Value of the Given Expression Using a Sum

question 4

Multiple Choice

Find the exact value of the given expression using a sum or difference formula. $$\cos \frac { 17 \pi } { 12 }$$

• A) \(\frac { ( \sqrt { 3 } + 1 ) ( 2 \sqrt { 2 } ) } { 8 }\)
• B) \(\frac { ( - \sqrt { 3 } + 1 ) ( 2 \sqrt { 2 } ) } { 8 }\)
• C) \(\frac { ( \sqrt { 3 } - 1 ) ( 2 \sqrt { 2 } ) } { 8 }\)
• D) \(\frac { ( - \sqrt { 3 } - 1 ) ( 2 \sqrt { 2 } ) } { 8 }\)