Write the value of ^ -1 ( 6). - Vidyadip

Question

Write the value of $\cos^{-1}(\cos6).$

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Answer

We know that $\cos^{-1}(\cos\text{x})=\text{x}$
Now,
$\cos^{-1}(\cos6)=\cos^{-1}\{\cos(2\pi-6)\}$
$=2\pi-6$

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