Evaluate each expression without using a calculator.

arccos (cos (3π/4))

Video transcript

Without using a calculator, determine the exact value of the expression cosine inverse of cosine pi divided by six where we have four possible answers pile of valued by 66 P pile of valued by three and two pile of valued by three. Now to solve this, we need to make use of a trade property from our book, The Property states that cosine in verse of cosine of sum value X is equals to X. Now we see in our problem Rx will be pi divided by six, which means this whole thing equals pi divided by six. We can then see the answer to our problem is answer a pi divided by six. OK. Hope to help you solve the problem. Thank you for watching. Goodbye.