T í n h
$$\begin{equation}\begin{split} f(\,x\,)= \int_{\,x}^{\,x+ \frac{\pi}{2}}\,\frac{\left | \sin\,t \right |}{1+ \sin^{\,2}\,t}\,\text{d}t \end{split}\end{equation}$$
T í n h
$$\begin{equation}\begin{split} f(\,x\,)= \int_{\,x}^{\,x+ \frac{\pi}{2}}\,\frac{\left | \sin\,t \right |}{1+ \sin^{\,2}\,t}\,\text{d}t \end{split}\end{equation}$$
0 thành viên, 1 khách, 0 thành viên ẩn danh