Write the Expression as the Sine, Cosine, or Tangent of a Double

question 212

Multiple Choice

Write the expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the expression.
- $$\cos ^ { 2 } 60 ^ { \circ } - \sin ^ { 2 } 60 ^ { \circ }$$

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

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