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Example 6: (a) Without using a calculator, use a half-angle identity to find the exact value of cos 150. (b) Now use an alternative identity

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Example 6: (a) Without using a calculator, use a half-angle identity to find the exact value of cos 150. (b) Now use an alternative identity (from section 7.1) to find the exact value for cos 150. Are your answers to (a) and (b) the same? Let's hope so! (Hint: try squaring both answers.) 304

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