Answer
$\approx0.77.$
Work Step by Step
I know that $\sec{x}=\frac{1}{\cos{x}}$, hence $\sec^{-1}{x}=\cos^{-1}{\frac{1}{{x}}}$.
I use a calculator in RAD mode and then round the result, hence: $\sec^{-1}{(1.4)}=0.7752\approx0.77.$
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