How do you use a calculator to evaluate #sec225^circ#?

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Answer 1 · 2018-05-11T02:40:05

Type #sec(225^∘)# or #1/cos(225^∘)#

Just like type it into your calculator

Answer 2 · 2018-05-11T05:04:03

#- sqrt2#

Calculator -->
#cos 225 = - 0.707 = - sqrt2/2#
#sec 225 = 1/(cos) = - 2/sqrt2 = - sqrt2#