cos(A-B)=cosAcosB+sinAsinB proof
Video related to cos(α+β)=cosαcosβ-sinαsinβ:
https://www.youtube.com/watch?v=-n6h6-CT0-0
Also, remember that:
cos(-θ) = cos(θ)
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https://www.youtube.com/watch?v=nFuU4v425Zc
What you *need* in order to follow this video series:
1. Algebraic skills {http://mathsvideos.net/useful-algebraic-formulas/}
You need to know that: √(ab) = √a√b
2. Trigonometry skills:
- Unit circle {https://scontent-lhr3-1.xx.fbcdn.net/v/t31.0-8/14324643_627264727441617_168387912534466908_o.jpg?oh=ea3f9cec2389ced6eaa76830057e7d85&oe=58FE04F9}
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https://www.youtube.com/watch?v=fwoQkeF6A_Q
If a/b=c/d, then a/b=(a+c)/(b+d) mathematical proof (quicker version)
For more maths proofs, visit:
http://www.mathsvideos.net
****Apologies for the shakiness at the end of the video; sometimes my hand just gets tired. I have to film these clips by myself. I hope it doesn't affect the usefulness of this video.
Video created by Tiago Hands:
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https://www.youtube.com/watch?v=0H5mGSy7mGM
In this video - I show you how to demonstrate, from first principles, why the surface area of a cuboid is dependent on its length, width and height. In the process we discover the formula S(l, w, h)=2(l(w+h)+wh) which can be used to calculate the surface area of any cuboid. I hope you enjoy this video, and if you have any questions, leave them in comments section. Thanks for watching!
This video was created by:
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Thanks for watching this video and make sure you have subscribed if you want to see more videos like this!
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https://www.youtube.com/watch?v=EZUH61QgOyg
In this video I give you a very basic introduction to Venn diagrams and their use in sorting probabilities. This video was made for students studying A-Level statistics but is also suitable for the casual learner.
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https://www.youtube.com/watch?v=aNWYzkSOSqI
The connection between the unit circle and sine wave visualised.
Background image credits: https://pixabay.com/photos/helix-nebula-ngc-7293-11156/
This video was created by:
https://www.twitter.com/tiago_hands
For more mathematics content, check out:
https://www.threads.net/@mathematics.proofs
https://www.instagram.com/mathematics.proofs
Thanks for watching this video and make sure you have subscribed if you want to see more videos like this!
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https://www.youtube.com/watch?v=paUWc7mPiUc
How to differentiate y=ln(cosecx), Chain Rule version
Video by: Tiago Hands (https://www.instagram.com/tiago_hands/)
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Mathematics Proofs (Instagram): https://www.instagram.com/mathematics.proofs/
Scientific Quotes (Instagram): https://www.instagram.com/scientific.quotes/
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https://www.youtube.com/watch?v=ahM8r5OYsT0
In this video I explain in great detail and STEP by STEP why the formula for the sum of an arithmetic series is S_n=(n/2)*[2a+(n-1)d]. My goal here on Youtube is to help you understand why certain mathematical formulas exist before you begin working with them. This, I believe, will give you a deeper understanding of mathematical principles.
If this video is a bit too complicated for you, then I would suggest watching the video below first - then returning here at a later date:
https://youtu.be/3p87wDxR0LM
To support my work, follow me on Instagram here:
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Thanks for watching!
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https://www.youtube.com/watch?v=6U_qxdBGIwU