Use a calculator to find an approximate value of the expression rounded to three decimal places, if it is defined. State your answer in radians and degrees. (If an answer is undefined, enter UNDEFINED.)
cos−1

4
5

radians
degrees	  °

The approximate value of the expression \(\cos^{-1}\left(\frac{4}{5}\right)\) is:

- **Radians**: 0.644 radians (rounded to three decimal places)
- **Degrees**: 36.870° (rounded to three decimal places)

Would you like more details or have any other questions?

Here are 5 related questions:
1. How do you convert from radians to degrees?
2. What is the value of \(\cos(36.87^\circ)\)?
3. What is the range of the arccos function?
4. How do you evaluate inverse trigonometric functions for different values?
5. Can inverse trigonometric functions have multiple solutions?

**Tip:** To switch between radians and degrees in trigonometry, use the conversion factor \(\pi \text{ radians} = 180^\circ\).

Use a calculator to find an approximate value of the expression rounded to three decimal places, if it is defined. State your answer in radians and degrees. (If an answer is undefined, enter UNDEFINED.) cos−1(4/5) radians degrees °

Learn how to compute the inverse cosine (cos⁻¹) of 4/5 and find the approximate value rounded to three decimal places in both radians and degrees. Understand the steps of converting radians to degrees and applying trigonometric principles. This problem is ideal for high school students in Grades 10-12.

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