$\pi r^2$ $a{x}^2+bx+c=0$ $x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$ $A=\left[\begin{array}{cc}x& y\\ z& w\end{array}\right]$ ${\int }_1^t\frac{dx}{x}$ $a{x}^2+bx+c=0$ $2x\times -\frac{1}{16}+{-5}^2=24⁤\frac{15}{16}$ $E=m{c}^2$ $\left\{\right[a+b+c)-d\}$ $\left(a+b\right)$ $\begin{array}{c}8.44x+55y=0\\ 3.1x-0.7y=-1.1\end{array}$ $\sin x + 5$ $\overline{)x+y}$ $\sqrt[3]{x}$ $\sqrt[4]{\mathrm{64}}$ $\sqrt[3]{x}+1$ $\sqrt[5]{x}$ $\sqrt[\frac{-1}{3}]{x+1}$ $f(a)=\frac{1}{2\pi i}\oint \frac{f(z)}{z-a}dz$ $\cos (\theta +\phi )=\cos (\theta )\cos (\phi )-\sin (\theta )\sin (\phi )$ $(4x^{\frac{1}{4}}){(9x)}^{\frac{1}{2}}$ ${\log }_{2}x$ $\ln e=1$ $V=\frac{4}{3}\pi r^3$ $x_1+x_2-x_3$ ${\sin }^{2}x+{\cos }^{2}y=1$ ${\mathrm{\nabla }}^{\to }\cdot F^{\to }=(\frac{\partial F_z}{\partial y}-\frac{\partial F_y}{\partial z})i+(\frac{\partial F_x}{\partial z}-\frac{\partial F_z}{\partial x})j+(\frac{\partial F_y}{\partial x}-\frac{\partial F_x}{\partial y})k$ $ABC△$ $\stackrel{\text{⌒}}{AB}$ $\overleftarrow{AB}$ $10\because 5$ $li{m}_{x\to \mathrm{\infty }}f(x)$ $A=4\pi r^2$ $\sin A=\frac{A}{C}$ $\cos A=\frac{B}{C}$ ${\sin }^{-1}x=arcsinx$ $\tan \theta =\frac{A}{B}$ $\cot A=\frac{B}{A}$ $\sec A=\frac{C}{A}$ $\csc A=\frac{C}{B}$ $\frac{\mathrm{xx}}{\mathrm{yy}}$ $\pi r^2$ $a{x}^2+bx+c=0$ $x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$ $A=\left[\begin{array}{cc}x& y\\ z& w\end{array}\right]$ ${\int }_1^t\frac{dx}{x}$ $a{x}^2+bx+c=0$ $2x\times -\frac{1}{16}+{-5}^2=24⁤\frac{15}{16}$ $E=m{c}^2$ $\left\{\right[a+b+c)-d\}$ $\left(a+b\right)$ $\begin{array}{c}8.44x+55y=0\\ 3.1x-0.7y=-1.1\end{array}$ $\sin x + 5$ $\overline{)x+y}$ $\sqrt[3]{x}$ $\sqrt[4]{\mathrm{64}}$ $\sqrt[3]{x}+1$ $\sqrt[5]{x}$ $\sqrt[\frac{-1}{3}]{x+1}$ $f(a)=\frac{1}{2\pi i}\oint \frac{f(z)}{z-a}dz$ $\cos (\theta +\phi )=\cos (\theta )\cos (\phi )-\sin (\theta )\sin (\phi )$ $(4x^{\frac{1}{4}}){(9x)}^{\frac{1}{2}}$ ${\log }_{2}x$ $\ln e=1$ $V=\frac{4}{3}\pi r^3$ $x_1+x_2-x_3$ ${\sin }^{2}x+{\cos }^{2}y=1$ ${\mathrm{\nabla }}^{\to }\cdot F^{\to }=(\frac{\partial F_z}{\partial y}-\frac{\partial F_y}{\partial z})i+(\frac{\partial F_x}{\partial z}-\frac{\partial F_z}{\partial x})j+(\frac{\partial F_y}{\partial x}-\frac{\partial F_x}{\partial y})k$ $ABC△$ $\stackrel{\text{⌒}}{AB}$ $\overleftarrow{AB}$ $10\because 5$ $li{m}_{x\to \mathrm{\infty }}f(x)$ $A=4\pi r^2$ $\sin A=\frac{A}{C}$ $\cos A=\frac{B}{C}$ ${\sin }^{-1}x=arcsinx$ $\tan \theta =\frac{A}{B}$ $\cot A=\frac{B}{A}$ $\sec A=\frac{C}{A}$ $\csc A=\frac{C}{B}$ $\frac{\mathrm{xx}}{\mathrm{yy}}$