Question 387849
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*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \cos\left(\frac{\pi}{2}\right)\ =\ 0]


And 


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \sec(\varphi)\ =\ \frac{1}{\cos(\varphi)]


Hence


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \sec\left(\frac{\pi}{2}\right)\ =\ \frac{1}{\cos\left(\frac{\pi}{2}\right)}\ =\ \frac{1}{0}]


is undefined.


In other words,


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \lim_{x\rightarrow\frac{\pi}{2}}\ \sec(x)\ =\ +\infty] 


John
*[tex \LARGE e^{i\pi} + 1 = 0]
My calculator said it, I believe it, that settles it
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