### 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:
\begin{equation}
1 = \cos^2 \theta + \sin^2 \theta
\end{equation}
\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 3Getting started):