**About the LaTeX symbols, I cannot use \arcsec and \arccsc, please add them to the LaTeX library**

**Answer:**

Inverse secant and cosecant functions are not initially defined in LaTeX amsmath library which is used here.

To use them correctly inside math environment on Slader you can do following:

$\text{arcsec } x$

Notice the space at the end. It is to separate the function from x.

Also, if you are using LaTeX on your own machine and not on Slader then you can define your own operator using:

\DeclareMathOperator{\arcsec}{arcsec}