# Thread: I don't know what this means???

1. ## I don't know what this means???

find the values of cos^(-1)(1)

and I know the answer is 0 but I don't know how to get there...

2. Originally Posted by aamk23
find the values of cos^(-1)(1)

and I know the answer is 0 but I don't know how to get there...

$cos^{-1}1=y$

cos y =1

From the cosine graph , y=0 when it is maximum (1) .

3. ok thanks so much!