https://youtu.be/LMjVp-GsrCw

In this video I use the definition of derivative to derive the derivative for cos(x). Make sure you remember this derivative as it comes up through math and engineering in modeling parabolic or repetitive functions.

Download video notes: https://1drv.ms/b/s!As32ynv0LoaIidtDg22vsQ2CcV20aw?e=qpsD3K

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# Trigonometry: Derivative of cos(x)

![Derivative of cos(x) Resized AI.jpg](https://files.peakd.com/file/peakd-hive/mes/23tHb6kVXXqqjNcPm4f5vpPYK1YjpBw5rc1tqQTFPCZrkxfnDWqmKk2vdTig8ZYri21wF.jpg)

## Using the Definition of Derivative

![image.png](https://files.peakd.com/file/peakd-hive/mes/23t8CfKPvxwqMhy36VcYV8SCt7FGxdtiyd6p9dS4NDd4TzSkoshG9YfEx1GPSbmA9CBgY.png)

![image.png](https://files.peakd.com/file/peakd-hive/mes/23tHb6kpi5edHubtjFgXvw1WKQmJu9Pod5D1ds5ayuAHf5tLaN4vutF3wHX1Regpnq7Gw.png)

![image.png](https://files.peakd.com/file/peakd-hive/mes/23tHbKgySWQBnMx6iGVTembMam7nnMLpHNTona9ZgQtY7dLev9rvr1rjrvDgjieSLoGUx.png)

![image.png](https://files.peakd.com/file/peakd-hive/mes/23tHbKgySK5PwwsbKZK9c9WX4ERgMp4r3upzCo8gbenFSUvDqKoojW6Mi9dYzsS4zTHLM.png)