How do you use a calculator to evaluate $sec79.3^circ$ ?

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Answer 1 · 2017-01-23T18:42:41

$5.3860 (4dp)$

we have to use the fact that $secx=1/cosx$

so: $sec79.3^0=1/cos79.3^0$

from a calculator, in degree mode:

$1/(cos79.3^0)=1/(0.1856666154$

$=5.385997897$

$=5.3860 (4dp)$

if you have a calculator such as Casio fx-83ES

you can type

$1/cos79.3^0$

directly press $=$ and get the answer immediately without using the reciprocal key,

How do you use a calculator to evaluate sec79.3^circsec79.3^circ?