1.  0

3.  -1

4.  does not exist

1.  Both A and R are true and R is the correct explanation of A

3.  A is true but R is false

4.  A is false but R is true

2.  Both A and R are true but R is not correct explanation of A

3.  A is true but R is false

4.  A is false but R is true

1.  

2.  

3.  

1.  0

2.  1

4.  does not exist

1.  0

3.  -1

4.  does not exist

1.  [1/2-π/3, 1+π/3]

2.  

4.  

1.  2

2.  3

4.  6

1.  

3.  

4.  

2.  x2/4-y2/16=1

3.  x2/9+y2/16=1

4.  x2/4-y2/16=1