# [Tex/LaTex] Why might \sin and \cos be italicized in the output

amsmathitalicmath-modeunicode-math

### Introduction

I know that \sin and \cos are supposed to produce non-italicized (operator) output when in math mode.

Oddly, these macros are producing italicized output, as if I had typed sin or cos—that is, without the backslash.

### My Question

The unicode-math package seems to be at fault here. What's going on, and why would it override the trig commands?

### Minimum Working Example (MWE)

I've got a rather large document, so my MWE includes a few packages that may seem unusual for this MWE. I've stripped it down quite a bit to get what is given below.

Here's the preamble:

\documentclass[10pt,letterpaper,notitlepage,final]{report}
%%##$#% !BIB TS-program = biber % The above line is REQUIRED -- see http://tex.stackexchange.com/questions/38348/in-texshop-is-there-a-directive-to-select-biber-or-bibtex-on-a-per-document-bas \usepackage[T1]{fontenc} \usepackage{lmodern} % better font -- REQUIRED for special unicode characters \usepackage{unicode-math} % for \oiint command (also loads fontspec) \usepackage{amsmath} % conflicts with \oiint \usepackage[arrow]{hhtensor} % for vector and tensor notation \usepackage{graphicx} % Allows me to include figures \begin{document} Here's an equation: $$1 = \cos^2 \theta + \sin^2 \theta$$ \end{document}  #### Best Answer unicode-math should be loaded after all font-packages (well, packages, that load fonts as well, like amsmath etc.) are loaded, to provide the corresponding changes. The unicode-math package states (see section 3 Getting started): Load unicode-math as a regular LATEX package. It should be loaded after any other maths or font-related package in case it needs to overwrite their definitions \documentclass[10pt,letterpaper,notitlepage,final]{report} %%##$#% !BIB TS-program = biber
% The above line is REQUIRED -- see http://tex.stackexchange.com/questions/38348/in-texshop-is-there-a-directive-to-select-biber-or-bibtex-on-a-per-document-bas

\usepackage{amsmath}  % conflicts with \oiint
\usepackage[arrow]{hhtensor}  % for vector and tensor notation
\usepackage{graphicx}   % Allows me to include figures
\usepackage{unicode-math}  % for \oiint command (also loads fontspec)

\begin{document}
Here's an equation:
$$1 = \cos^2 \theta + \sin^2 \theta$$

\end{document}