Write the orincipal value of ^ -1 ( 680^ ) - Vidyadip

Question

Write the orincipal value of $\cos^{-1}(\cos680^\circ)$

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Answer

$\cos^{-1}(\cos680^\circ)=\cos^{-1}[\cos(720^\circ-680^\circ)]$
$=\cos^{-1}(\cos40^\circ)$
$=40^\circ$

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