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

• July 29th 2009, 10:42 PM
aamk23
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...
• July 29th 2009, 11:03 PM
Quote:

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) .
• July 29th 2009, 11:09 PM
aamk23
ok thanks so much!