Write the Product as a Sum or Difference of Trigonometric $\cos \left( - \frac { 7 \pi } { 12 } \right)$

question 29

Multiple Choice

Write the product as a sum or difference of trigonometric functions.
- $\cos \left( - \frac { 7 \pi } { 12 } \right)$

• A) \(\sqrt { 2 } - \sqrt { 6 }\)
• B) \(\frac { \sqrt { 2 } - \sqrt { 6 } } { 4 }\)
• C) \(\frac { \sqrt { 6 } - \sqrt { 2 } } { 4 }\)
• D) \(\sqrt { 6 } + \sqrt { 2 }\)

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