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Maecenas

Morbi diam sem, rhoncus $∇→×F→=(∂Fz∂y−∂Fy∂z)i+(∂Fx∂z−∂Fz∂x)j+(∂Fy∂x−∂Fx∂y)k$ sit amet iaculis eget, vulputate eget metus. Proin sed nisl facilisis, tincidunt massa et, pellentesque sapien. Praesent hendrerit, odio a vehicula lacinia, diam ipsum porttitor massa, vitae bibendum risus enim sit amet justo.

$$F(x,y)=0 ~~\mbox{and}~~ \left| \begin{array}{ccc} F''_{xx} & F''_{xy} & F'_x \\ F''_{yx} & F''_{yy} & F'_y \\ F'_x & F'_y & 0 \end{array}\right| = 0$$

ornare

Etiam sed aliquam orci, semper tincidunt metus. Fusce vel urna dolor. Vivamus nec arcu ac mauris accumsan pellentesque vel sit amet nibh. Maecenas eget velit varius, varius lacus vel, vestibulum diam. Vestibulum elementum nisl nibh, commodo aliquet ipsum ornare a. Morbi condimentum mi id ipsum pretium, adipiscing egestas mi feugiat.

$$\underbrace{a+\overbrace{b+\cdots}^{{}=t}+z} _{\mathrm{total}} ~~ a+{\overbrace{b+\cdots}}^{126}+z$$

Vestibulum $(a+b)^3$ elementum nisl nibh, commodo $(a^2+2ab+b^2)(a+b)$ aliquet ipsum ornare a. Morbi condimentum mi id ipsum pretium, adipiscing egestas mi feugiat.

msan pellentesque vel sit amet nibh. Maecenas eget velit varius, varius lacus vel, vestibulum diam. Vestibulum elementum nisl nibh, commodo aliquet ipsum ornare a. Morbi condimentum mi id ipsum pretium, adipiscing egestas mi feugiat.

$$\begin{gather*} a_0=\frac{1}{\pi}\int\limits_{-\pi}^{\pi}f(x)\,\mathrm{d}x\\[6pt] \begin{split} a_n=\frac{1}{\pi}\int\limits_{-\pi}^{\pi}f(x)\cos nx\,\mathrm{d}x=\\ =\frac{1}{\pi}\int\limits_{-\pi}^{\pi}x^2\cos nx\,\mathrm{d}x \end{split}\\[6pt] \begin{split} b_n=\frac{1}{\pi}\int\limits_{-\pi}^{\pi}f(x)\sin nx\,\mathrm{d}x=\\ =\frac{1}{\pi}\int\limits_{-\pi}^{\pi}x^2\sin nx\,\mathrm{d}x \end{split}\\[6pt] \end{gather*}$$