v v vab sin text n^
\vec v~~~\vec{v}~~~\vec{v}_{a}^{b}~~~\vec{\sin}~~~\vec{\text{text}}~~~\hat n
n→∞lim∣ana(n+1)∣
\lim_{n\to\infin}|\frac{a_{(n+1)}}{a_n}|
eiθ=(cosθ,sinθ)=[cosθsinθ−sinθcosθ]
e^{i\theta} = (\cos\theta, \sin\theta) = \begin{bmatrix} cos\theta & -sin\theta \\ sin\theta & cos\theta \end{bmatrix}
f(x)=n=0∑∞n!f(n)(0)xn=0!f(0)+1!f′(0)x+2!f′′(0)x2+⋯
f(x) = \sum_{n=0}^{\infin}\frac{f^{(n)}(0)}{n!}x^n = \frac{f(0)}{0!}+\frac{f'(0)}{1!}x + \frac{f''(0)}{2!}x^2+\cdots
