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Question
5.3.3
Can you please help me with this problem? Thanks.
cos x/2 = -(sqrt3)/2

Answer
Dear John,

First use the Pythagorean identity to determine the value of sinēθ.
Then use the Double-angle formula to determine cosθ and take the inverse to find θ, which has two values.

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Janet Yang

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I can answer questions in Algebra, Basic Math, Calculus, Differential Equations, Geometry, Number Theory, and Word Problems. I would not feel comfortable answering questions in Probability and Statistics or Topology because I have not studied these in depth.

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I tutor students (fifth through twelfth grades) and am a Top Contributor on Yahoo!Answers with over 24,000 math solutions.

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Co-author of An Outline of Scientific Writing: For Researchers With English as a Foreign Language

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I have a Bachelor's degree in Applied Mathematics from the University of California at Berkeley.

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George White Elementary School. Homework Help program at the Ridgewood Public Library, Ridgewood, NJ. Individual students.

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