Bitime

$a^2 + b^2 = c^2$

$$\frac{\delta E_{x}}{\delta t} = \frac{\delta f(z-ct)}{\delta t} = f^{\prime}(z - ct)\Big(\frac{\delta(z-ct)}{\delta t}\Big) = -c*f^{\prime}(z - ct)$$ $$\frac{\delta^2 E_{x}}{\delta t^2} = \frac{\delta}{\delta t} \Big(\frac{\delta Ex}{\delta t}\Big)= f^{\prime\prime}(z - ct)\Big(\frac{\delta(z-ct)}{\delta t}\Big) = c^2*f^{\prime\prime}(z - ct)$$

Bitime	T2	T3	T4	T5	T6	T7	CN
Sáng	xx			xx	yy	yy
Chiều		xx		xx	xx

Next you can update your site name, avatar and other options using the _config.yml file in the root of your repository (shown below).

The easiest way to make your first post is to edit this one. Go into /_posts/ and update the Hello World markdown file. For more instructions head over to the Jekyll Now repository on GitHub.

$$\nabla_\boldsymbol{x} J(\boldsymbol{x})$$ $$\nabla_\boldsymbol{x} J(\boldsymbol{x})$$