2. Out of the two different methods used to evaluate definite integral by substitution, which one is better to use? Illustrate. 3 sin x+1 cosx dx. by using substitution. 3/2 3. Evaluate 4. Evaluate +4 dt by using substitution. 5. Evaluate (9+x) dx by using substitution. 6. Evaluate (x+5)* dx by using substitution. 7. 8. 9. 10. Evaluate (1+x) dx by using substitution. =/2 Evaluate cos(1+x) dx by using substitution. Evaluate [(1+2x) dx by using substitution. Evaluate 2x+1 dx by using substitution.