`a)` 

`A \cap B = (-2; 6) \cap [-3; 4] = (-2; 4]`

`A \cup B = (-2; 6) \cup [-3; 4] = [-3; 6)`

`A \setminus B = (-2; 6) \setminus [-3; 4] = (4; 6)`

`B \setminus A = [-3; 4] \setminus (-2; 6) = [-3; -2]`

`b)`

`C_RR A = R \setminus (-2; 6) = (-oo; -2] \cup [6; +oo)`

`C_RR B = R \setminus [-3; 4] = (-oo; -3) \cup (4; +oo)`

`C_RR(A \cap B) = R \setminus (-2; 4] = (-\infty; -2] \cup (4; +\infty)`

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