Use a Sum or Difference Identity to Find the Exact $\frac { \sin ^ { 2 } x - 1 } { \cos ( - x ) }$

question 270

Multiple Choice

Use a sum or difference identity to find the exact value.
- $\frac { \sin ^ { 2 } x - 1 } { \cos ( - x ) }$

• A) \(- \cos x\)
• B) \(\sin x\)
• C) \(\cos x\)
• D) \(- \sin x\)

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