Question

lim as x approaches 0 of (-2)/(cos(x))

Answer 1

what do you get when you replace \(x\) by \(0\) ?

Answer 2

it would be -2 but sorry i meant to say as x approaches pi/2

Answer 3

what do you get when \(x\) approaches \(\frac{\pi}{2}\) ?

Answer 4

0

Answer 5

let me rephrase that
what you you get literally when \(x=\frac{\pi}{2}\) ?
hint, it is certainly not zero

Answer 6

so -2/cos(pi/2) would be DNE?

Answer 7

yes

Answer 8

you get
\[-\frac{2}{0}\] so there is no limit

Answer 9

if you got
\[\frac{0}{0}\] you would have more work to do

Answer 10

oh ok thank you and one more, how do i do limit as x approaches 9pi/4 of( cos(x)-1)/(6x)? i got -sqrt(2)-1/(27pi) but i dont think thats correct