The LaTeX command for arcsin is \arcsin.
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Write \arcsin inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. It is part of core LaTeX math, so no extra package is required.
\arcsin sets the name upright with operator spacing; typed as plain letters it would print in italics, as a product of variables.
$\arcsin_{i=1}^{n} x_i$Open this example in the live preview: it renders as you type, with no compiler and no signup.
\operatorname{span}\operatorname*{argmax}\operatorname*{argmin}\operatorname{lcm}\sin\cos\tan\arccos\arctan\sinh\cosh\tanh\cot\secMath operators in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \arcsin in math mode; it needs no extra package. For example, $\arcsin_{i=1}^{n} x_i$.
None: \arcsin is built into LaTeX, so no extra package is required.