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,