Evaluate the half angle in radians for cosine

The video tutorial explains how to determine the sign of cosine based on the angle's position in different quadrants. It covers the application of the cosine formula, emphasizing the importance of recognizing when cosine is negative. The tutorial also discusses handling fractions in calculations and the significance of angle positions in determining the sign of trigonometric functions.

What challenges might arise when dealing with angles expressed in eighths or twelfths?

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How does the formula change when considering different quadrants for trigonometric functions?

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