Proof of the derivative of cosx: A Step-by-Step Proof and Explanation

In this video, we dive into the proof of the derivative of cos(x) using limit definition of the derivative, also known as the first principle.
Follow along as we break down each step and provide a clear explanation of the process.
Enhance your understanding of trigonometric derivatives with this comprehensive tutorial.
If you're eager to explore more differentiation techniques for various functions, click the link below.
• Easy Differentiation w...
Stay tuned for a variety of upcoming differentiation videos. Additionally, I recommend watching the easy integration videos using the Box Rule below, as they will complement your learning experience.
• Easy Integration witho...
Also, there are various other videos available on my channel and more will be uploaded continuously, so feel free to visit and check them out.
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[@ily2762]

Thank you so much!!

[@mathwithalex]

It is my pleasure!!!

[@kindiakmath]

I love the conversion into cos^2 - 1 = -sin^2; my usual approach is the double angle formulae cos^2 - 1 = 2 sin^2, which feels more tricky than the approach you gave.

[@mathwithalex]

Thank you. There's a lot of helpful information on your channel that I can watch and learn from. I'll be sure to check it out.

[@luisclementeortegasegovia8603]

Difficult to read, no focus and numbers too small.

[@mathwithalex]

I apologize for any inconvenience in watching the videos. To enhance the video quality, I am producing content in Full HD at 60FPS. Since it involves handwriting, I sometimes find myself unintentionally reducing the font size despite intending to write larger. I appreciate your feedback, and I'll make sure to incorporate your suggestions into future videos. Thank you.

[@winonamama8358]

maybe because you are watching on an flip phone

[@lcfrod]

Nice and clear. Thanks for sharing.

[@mathwithalex]

Glad it was helpful! Thank you so much!

[@connerisaacs2625]

This proof is complex jeez

[@mathwithalex]

It seems my explanation was a bit complicated. I'm sorry about that. I'm still a beginner KZbinr and have a lot to learn. I hope you understand.