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$ MathJax $

When $a \ne 0$, there are two solutions to $ax^2 + bx + c = 0$ and they are \[x = {-b \pm \sqrt{b^2-4ac} \over 2a}.\]

Cauchy’s Integral Formula is: $f(a) = \frac{1}{2\pi i} \oint\frac{f(z)}{z-a}dz$ !!!

$\cos(\theta+\phi)=\cos(\theta)\cos(\phi)−\sin(\theta)\sin(\phi)$

import std.stdio;

void main()
{
    writeln("hello world");
}

inline