2. (10%) Find the derivative $f'(x)$ of the function f(x) = ∫_x^x^2 √1 + t^3 dt

二、(50%)(所有題目請敘述計算過程，無計算過程不給分) 1. (10%) Let $A, B, C$ be $p \times q, m \times n, n \times p$ matrices and denote the $(i, j)$-entries of $A, B, C$ by $a_{ij}, b_{ij}, c_{ij}$ respectively. (a) (5%) Please write down the $(i,j)$-entry of the product $BCA$ in terms of Sigma notations (i.e. $\Sigma$).