Limit of sec(x) as x goes to pi/2, does the limit exist?

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Homework Statement



lim sec(x)
x-> pi/2 from the left

Homework Equations





The Attempt at a Solution


I wasn't quite sure where to start. I know sec is 1/cos. Does the limit not exist?
 
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What's the value of cos(pi/2)?
 

Thread 'Finding the nth roots of a complex number'

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