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

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

Mathematics
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explanation would be nice also :)
are you talking about 1/cos or arccos.... very different things...
i dunno its gives me that in the book i have

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Other answers:

prob arccos or inverse cos. think of your unit circle, what angle makes cosA = -1 ?
are you doing questions on solving trig equations or solving inverse trig equations...
could be sec(x) = -1
just cos ^-1 (1) looks like arc cos
dumbcow my answer is 0/2 ?
http://www.wolframalpha.com/input/?i=cos%5E-1++%28-1%29
tyvm :)
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