Problem 160 of 7
Compare exact and decimal trig value for cos(5pi/6).
Hints
Using a hint is okay. It just tells the trainer to give you a little more review.
Hidden until you reveal it.
preserve exact radicals and approximate when needed.
Hidden until you reveal it.
Preserve exact radicals and approximate when needed for common angles.
Enter your answer
No answer yet
Correct
Your answer is equivalent to the expected form.
Solution
Walkthrough
Walkthrough shown
Full solution stays hidden until you ask for it.
1. Evaluate the exact unit-circle value.
2. Approximate radicals or fractions if requested.
3. Compare exact and decimal forms as same value.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Replacing exact requested values with rounded decimals only.