Question

This is for Trigonometry: What is arccos?

Answer 1

\[\arccos(x)\] is the number in the interval \([0,\pi]\) whose cosine is \(x\)

Answer 2

is also, the other notation use for arccos

Answer 3

I prefer to think of it as the angle whose cosine is x. Although, the angle, if in radians, is a number.

Answer 4

another way to think of it

Answer 5

http://www.mathopenref.com/arccos.html