# Known Slugs

This lesson deals with functions which make your C program slower.

## We'll cover the following

There are some C functions that are known to be slow.

## Slow math functions

`pow()`

, `sqrt()`

, and trigonometric functions (e.g. `sin()`

, `cos()`

, `tan()`

, etc.

When using `pow()`

with integers, just use basic operators instead. For example instead of this:

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