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Using principle value, evaluate the following : $ \cos^{-1} \bigg( \cos\large\frac{2\pi}{3} \bigg)$$ + \sin^{-1} \bigg( \sin\large\frac{2\pi}{3} \bigg) .$

1 Answer

\[Ans:\:\frac{2\pi}{3}+\frac{\pi}{3}=\pi\]
answered Feb 17, 2013 by rvidyagovindarajan_1
 

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