Answer
$\approx 1.8508$
Work Step by Step
RECALL:
$\sec{x} = \dfrac{1}{\cos{x}}$
Use the rule above to obtain:
$\sec{1} = \dfrac{1}{\cos{1}}$
Use a calculator in RAD mode then round-off the answer to four decimal places to obtain:
$\sec{1} \approx 1.8508$
