1.A ∪B={ 1,2,3,4 };
2.A-B = { 2 };
3. Domain name: 1
4.f( 1) because1>; 0, so f( 1)=4 times1+2 = 6;
5. {y = t power of e; T = arctangent √x (where t = arctangent √ x