Trigonometry of Sums and Differences of Angles HSF.TF.C.9 Grade 10 SBAC Practice Test Questions TOC | Lumos Learning

Trigonometry of Sums and Differences of Angles HSF.TF.C.9 Question & Answer Key Resources Lumos StepUp - SBAC Online Practice and Assessments - Grade 10 Mathematics

Lumos StepUp - SBAC Online Practice and Assessments - Grade 10 Mathematics Trigonometry of Sums and Differences of Angles

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Recall that \cos \left(\alpha -\beta \right)=\cos \alpha \cos \beta +\sin \alpha \sin \beta. What is the exact value of \cos \frac{\pi }{12} ?
  1. \frac{\sqrt{6} }{4} +\frac{\sqrt{2} }{4}
  2. -\frac{\sqrt{6} }{4} +\frac{\sqrt{2} }{4}
  3. -\frac{\sqrt{2} }{4} -\frac{\sqrt{6} }{4}
  4. \frac{\sqrt{3} }{2} +\frac{\sqrt{2} }{2}

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Standard(s):HSF.TF.C.9

Standard Description: Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.

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