Question

Find the exact real value of arccos

Answer 1

arccos of what? Arc cosine would be the inverse function of Cosine. Kind of coming from the relationship between an angle, and an arc produced from the triangle in which this angle is on.

Answer 2

cos of a theta, would be like defining a line at theta angles. then finding ratio of its horizontal component to its length.
I say "component" because every line can be made by adding to other line segments, or "vectors"

Answer 3

arc cosine gives an angle when given th