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Write the principal value of : $ \cos^{-1}\bigg( \cos\large\frac{7\pi}{6} \bigg). $

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Ans:

\[Cos^{-1}Cos(\pi+\frac{\pi}{6})=Cos^{-1}cos(\pi-\frac{\pi}{6})=\frac{\pi}{6}\]
answered Feb 17, 2013 by rvidyagovindarajan_1
 
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