26: After substituting the limit point into the given expression
you should get
![](gif8/eeb8az5.gif)
How did we get the last step? When an integer k satisfies
k > 0, then the denominator is positive and the
conclusion follows. If k < 0, then we again divide by a
positive number. What about k = 0? Then in the denominator
we have 0+⋅(−1) = 0-, so here the
situation is different and the sign changes.
Hint on limit at
1/2 from the left
Hint on limit at
1/2 from the right
Hint on limit at
k from the left
Answer