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OpenStudy (anonymous):
Evaluate without using a calculator. cos^-1(cos210degrees)
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OpenStudy (anonymous):
210 degree
OpenStudy (anonymous):
\[f^-1(f(x)) = x \]
OpenStudy (anonymous):
so its 210 degrees?
OpenStudy (anonymous):
Inverse functions cancel each other out.
OpenStudy (anonymous):
no that's not right here... the range of inverse cosine is [0, 180degrees] since cos(210) = cos(150), then \(\large cos^{-1}(210)=150 \)
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OpenStudy (anonymous):
Ah, good catch there, @ByteMe !
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