Evaluate the integral: $ I = \int e^{2x+3} \sin 6x \, dx $.
If \( f(x) \) is given as: \( f(x) = \begin{cases} 3ax - 2b, & x<1 ax + b + 1, & x<1 \end{cases} \) and \( \lim_{x \to 1} f(x) \) exists, then the relation between \( a \) and \( b \) is:
Evaluate the integral: $$ I = \int \frac{2}{1 + x + x^2} \,dx. $$