Uploaded June 2016 | Updated September 2026, 2 weeks ago
In this video we will derive the double angle identities for SIN, COS, and TAN. We will need the angle sum identities derived in the videos below:
For SIN and COS
goo.gl/Uzp7bM
For TAN
goo.gl/QRqiNf
In this video we will derive the double angle identities for SIN, COS, and TAN. We will need the angle sum identities derived in the videos below:
For SIN and COS
goo.gl/Uzp7bM
For TAN
goo.gl/QRqiNf
![Explained: NACA 4-Digit GUI Part 1/10 [MATLAB]](https://i.ytimg.com/vi/iQ1-C6c3YyA/mqdefault.jpg "Explained: NACA 4-Digit GUI Part 1/10 [MATLAB]
This is the first video in my 10-video series on coding a program in MATLAB to compute, display, and save a NACA 4-digit airfoil. The series starts right from the beginning, and we work our way to the final code. I explain everything I do, so it should be easy to follow.
IN THIS VIDEO:
We start by opening up a new graphical user interface by typing guide in the command window, and lay out our GUI buttons, boxes, etc. After saving the GUI, we format the resulting m-file for ease of coding in the subsequent videos.
If you havent watched my other videos on the NACA 4-digit airfoil series, I would recommend doing that now.
NACA 4-Digit Airfoil Theory
http://goo.gl/IMgb1W
NACA 4-Digit MATLAB Script
http://goo.gl/t0ksgp
IN THIS SERIES:
Part 1/10 : https://goo.gl/9UBgbo
Part 2/10 : https://goo.gl/jRRcYJ
Part 3/10 : https://www.youtube.com/watch?v=SbW1NDuvdJQ
Part 4/10 : https://goo.gl/HwHB39
Part 5/10 : https://goo.gl/AlDne8
Part 6/10 : https://goo.gl/7n1QP7
Part 7/10 : https://goo.gl/nTGleR
Part 8/10 : https://goo.gl/ez247P
Part 9/10 : https://goo.gl/8mXYcc
Part 10/10: https://goo.gl/ovBlbW
For the most up-to-date GUI, download the files from my GitHub account, linked to here:
https://github.com/jte0419/NACA_4_Digit_Airfoil")
![Explained: Axes GUI [MATLAB]](https://i.ytimg.com/vi/imyF5QjJ5c8/mqdefault.jpg "Explained: Axes GUI [MATLAB]
Axes can be used to display data on a plot, or even to display an image. This video shows how to display a plot with data in a MATLAB GUI.")
![Explained: Waitbar [MATLAB]](https://i.ytimg.com/vi/k2wKPxRUPiE/mqdefault.jpg "Explained: Waitbar [MATLAB]
A waitbar (or progress bar) allows you to visualize when a program will finish. The argument to the waitbar fills up the bar with the percentage specified. While its a fun way to see how long you have to wait until everything is done computing, it is extremely time consuming, and I would probably recommend just outputting data to the command window using fprintf.")
