Using a Sum or Difference Identity, Write the Following as an Expression

question 39

Multiple Choice

Using a sum or difference identity, write the following as an expression involving functions of x.
- $\sin \left( \frac { \pi } { 4 } - x \right)$

• A) \(\frac { \sqrt { 2 } } { 2 } \cos x - \frac { \sqrt { 2 } } { 2 } \sin x\)
• B) \(\sin x\)
• C) \(\frac { \sqrt { 2 } } { 2 } \cos x + \frac { \sqrt { 2 } } { 2 } \sin x\)
• D) \(- \cos x\)

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