Question

what is cos^-1(1)

Answer 1

That is better.

Answer 2

Find out where cos = 1 and that is your answer.

Answer 3

If you don't know where that is, use the unit circle.

Answer 4

https://www.google.com/search?q=cos%5E-1(1)&aq=f&oq=cos%5E-1(1)&aqs=chrome.0.57j0l3j62l3.694&sourceid=chrome&ie=UTF-8#q=scientific+calculator&revid=1408640600

Answer 5

I really do not know how to use the unit circle. I am suppose to do this without a calculator.

Answer 6

Nope, my bad.................

Answer 7

Look up information about the unit circle and how to read it.

In short, the x coordinate of the points on the unit circle correspond to the cos value of that point.

Answer 8

Example, at pi : we get the point (-1,0) which means cos(pi) = -1