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Mathematics 9 Online
OpenStudy (anonymous):

Find the exact answer of each expression. Cos^-1(-1)

OpenStudy (anonymous):

\[Cos ^{-1}(-1)\]

OpenStudy (anonymous):

you know a number whose cosine is \(-1\) ??

OpenStudy (anonymous):

Cos represents x. So 180degrees or pi?

OpenStudy (anonymous):

@satellite73 ?

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