Exam Review Evaluate the cosine inverse

The video tutorial explains how to find when the cosine is equal to negative sqrt 3/2 using the unit circle. It identifies the relevant points on the circle and discusses the restrictions of the cosine inverse function, focusing on the first and second quadrants. The tutorial concludes by determining that the only valid angle is 5π/6.

What is the value of cosine when it is equal to negative square root of 3 over 2?

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Identify the two points on the unit circle where cosine is equal to negative square root of 3 over 2.

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Explain why there can only be one answer for the inverse cosine function in this case.

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What is the restriction applied to the inverse cosine function in this context?

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What is the only angle where the X coordinate is equal to negative square root of 3 over 2?

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