Answer:
b
Step-by-step explanation:
I did it
How to get answer by Mimiwhatsup (In Decimal Form):

Answer in Fraction Form: 
Gotta add a picture to show us what you want us to do.







The first case occurs in

for

and

. Extending the domain to account for all real

, we have this happening for

and

, where

.
The second case occurs in

when

, and extending to all reals we have

for

, i.e. any even multiple of

.