三、試論「理論框架 (theoretical framework)」在質化研究中，扮演什麼樣的角色？又，如何建立質化研究的理論框架？(30%)

1. (10%) Let f(x) be a differentiable function as shown in Figure 1. It needs to compute the integral $\int_{a}^{b} f(x)dx$. For some reason, the integration is not possible. We decide to linearize f(x) at x = a$ and use the trapezoidal area $A$ to approximate the integral, i.e. $ \int_{a}^{b} f(x) dx \approx A $. Please find the area A.