Evaluate a definite integral or solve for unknowns by exploiting functional equations, symmetry (e.g., f(x) + f(a−x) relations), or clever substitutions that simplify the integrand.
Let $f(x) = \frac{2^{x+2} + 16}{2^{2x+1} + 2^{x+4} + 32}$. Then the value of $8\left(f\left(\frac{1}{15}\right) + f\left(\frac{2}{15}\right) + \ldots + f\left(\frac{59}{15}\right)\right)$ is equal to (1) 92 (2) 118 (3) 102 (4) 108
For a continuous function $f$ defined on the set of real numbers and the function $g(x) = 2x + 2$ defined as, $$\begin{aligned}
& \int_{-1}^{1} f(g(x))\, dx = 18 \\
& \int_{2}^{4} g(f(x))\, dx = 18
\end{aligned}$$ are satisfied. Accordingly, what is the value of the integral $\int_{0}^{2} f(x)\, dx$? A) 20 B) 23 C) 26 D) 29 E) 32