Math & Science ⇒ New at LaTeX coding

[Philosophaie]

I am new at LaTeX.

Could someone fix my code so it works.

Code: Select all

\documentclass[10pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\begin{document}
Some text here.
        $C_x = R1\timesR2 = \begin{array}{\hat{i} \hat{j} \hat{k}\\X1 Y1 Z1\\X2 Y2 Z2}	\end{array}$
        $C_{x_{12}} = (Y1 * Z2 - Z1 * Y2)$
        $C_{y_{12}} = (Z1 * X2 - X1 * Z2)$
        $C_{z_{12}} = (X1 * Y2 - Y1 * X2))$
        
\end{document}

[Johannes_B]

It would be better to state explicit errors problemm constructs. That means a meaningful title as well. For example, i have no idea how the output is supposed to look like.

Code: Select all

\documentclass[10pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\begin{document}
Some text here.
\begin{align*}
	C_x &= R1\times R2 = \begin{array}{c}%
		\hat{i} \hat{j} \hat{k}\\
		X1 Y1 Z1\\
		X2 Y2 Z2\\
	\end{array}\\
	C_{x_{12}} &= (Y1 * Z2 - Z1 * Y2)\\
	C_{y_{12}} &= (Z1 * X2 - X1 * Z2)\\
	C_{z_{12}} &= (X1 * Y2 - Y1 * X2))
\end{align*}

\end{document}

You can read a lot about mathematical typesetting in Math mode.