formulas

$$E = \frac{1}{2} L I^2$$

$$V = L \frac{dI}{dt}$$

$$u = \frac{v + u'}{1 + \frac{v \cdot u'}{c^2}}$$

$$\nabla \cdot \mathbf{E} = \frac{\rho}{\varepsilon_0},\ \nabla \cdot \mathbf{B} = 0,...$$

$$\frac{dT}{dt} = -k(T - T_{\text{env}})$$

$$S=k_B\ln\Omega$$

$$\small (\cos x+ i \sin x)^n=\cos(nx)+i\sin(nx)$$

$$f(x) = \sum_{n=0}^{\infty} \frac{f^{(n)}(a)}{n!} \cdot (x - a)^n$$

$$P(A|B) = \frac{P(B|A)P(A)}{P(B)}$$

$$P(E|F) = \frac{P(E \cap F)}{P(F)}$$

$$f(x) = \frac{1}{\sigma \sqrt{2\pi}} e^{-\frac{1}{2}\left(\frac{x-\mu}{\sigma}\right)^2}$$

$$\scriptsize \nabla \times \mathbf{F} = \begin{vmatrix} \mathbf{i} & \mathbf{j} & \mathbf{k} \\\\ \frac{\partial}{\partial x} & \frac{\partial}{\partial y} & \frac{\partial}{\partial z} \\\\ F_x & F_y & F_z \end{vmatrix}$$

$$\nabla \cdot \mathbf{F} = \frac{\partial F_x}{\partial x} + \frac{\partial F_y}{\partial y} + \frac{\partial F_z}{\partial z}$$

$$\nabla f = \frac{\partial f}{\partial x} \mathbf{i} + \frac{\partial f}{\partial y} \mathbf{j} + \frac{\partial f}{\partial z} \mathbf{k}$$

$$\scriptsize \begin{pmatrix} a & b \\ c & d \end{pmatrix} \begin{pmatrix} w & x \\ y & z \end{pmatrix} = \begin{pmatrix} aw + by & ax + bz \\ cw + dy & cx + dz \end{pmatrix}$$

$$\\ {x^2 \over a^2} + {y^2 \over b^2} + {z^2 \over c^2} = 1$$

$$ax + by + cz = d$$

$$\small R^2 = (x-x_0)^2 + (y-y_0)^2 + (z - z_0)^2$$

$$X(\omega) = \int_{-\infty}^{\infty}x(t)e^{-j\omega t}\,dt$$

$$U_r = \int_{0}^{\epsilon_Y}\sigma\mathop{d\epsilon} \approx \frac{\sigma_{YS}^2}{2E}$$

$$G = \frac{\tau}{\gamma}$$

$$U_t = \int_{0}^{\epsilon_f}\sigma\mathop{d\epsilon}$$

$$\nu = - \frac{\epsilon_x}{\epsilon_z} = -\frac{\epsilon_y}{\epsilon_z}$$

$$R = \frac{\rho l}{A}$$

$$\Delta L = L_0 \alpha \Delta T$$

$$\scriptsize P = A \left[\frac{(1+i)^n-1}{i(1+i)^n}\right] + G \left[\frac{(1+i)^n-in-1}{i^2(1+i)^n}\right]$$

$$A = P \left[\frac{i(1 + i)^n}{(1 + i)^n - 1}\right]$$

$$F = P(1 + i)^n$$

$$c = \lambda f$$

$$E = hf$$