Use the Formula for the Cosine of the Difference of Two

question 192

Multiple Choice

Use the Formula for the Cosine of the Difference of Two Angles
- $\cos \left( \frac { 5 \pi } { 18 } - \frac { \pi } { 9 } \right)$

• A) \(\frac { \sqrt { 3 } } { 2 }\)
• B) \(\frac { 1 } { 2 }\)
• C) \(\frac { 1 } { 4 }\)
• D) 1 Identify α and β in the following expression which is the right side of the formula for cos (α - β).

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