]> $$y=mx+b$$ $$m=\frac{y_1-y_2}{x_1-x_2}$$ $$$$ $$x_{\mathrm{1,2}}=\frac{-B\pm \sqrt{B^2-4AC}}{2A}$$ $$\colorbox[rgb]{1,1,0}{$A{x}^2+Bx+c=0$}$$ $$\colorbox[rgb]{.5,0,.5}{$\alpha =\beta ,\beta =\gamma \Rightarrow \alpha =\gamma $}$$ $$$$ $$\int x^{2}dx=\frac{x^3}{3}$$ $\int x^{2}dx=\frac{x^3}{3}$ $$$$ $$A+B\ne A+B$$