Answer:
The chosen topic is not meant for use with this type of problem. Try the examples below.
2
cos
(
x
)
−
1
=
0
3
x
=
4
−
x
x
−
5
=
−
3
Step-by-step explanation:
 
        
             
        
        
        
Answer:
  
 
 
  

Step-by-step explanation:
Let E be the set of all even positive integers in the universe Z of integers,
i.e 
E = {2,4,6,8,10 ....∞}
 be the characteristic function of E.
 be the characteristic function of E.
∴

For XE(2) 
  since x is an element of E (i.e the set of all even numbers)
  since x is an element of E (i.e the set of all even numbers)
For XE(-2) 
 since  - 2 is less than 0 , and -2 is not an element of E
   since  - 2 is less than 0 , and -2 is not an element of E
For { x ∈ Z: XE(x) = 1}
This can be read as:
x which is and element of Z such that X is also an element of x which is equal to 1.
∴

E = {2,4,6,8,10 ....∞}