Question

find exact value of the expression
cos^-1 (-1)

Answer 1

explanation would be nice also :)

Answer 2

are you talking about 1/cos or arccos.... very different things...

Answer 3

i dunno its gives me that in the book i have

Answer 4

prob arccos or inverse cos.
think of your unit circle, what angle makes cosA = -1 ?

Answer 5

are you doing questions on solving trig equations or solving inverse trig equations...

Answer 6

could be sec(x) = -1

Answer 7

just cos ^-1 (1)
looks like arc cos

Answer 8

dumbcow
my answer is 0/2 ?

Answer 9

http://www.wolframalpha.com/input/?i=cos%5E-1++%28-1%29

Answer 10

tyvm :)

Answer 11

Welcome