Problems with math of Inverse Kinematic

I just saw the most famous article in the DevForum trying to make “Inverse Kinematic”, but I’m having a hard time because I don’t know what the calculation is.
How can I make it like that article? Thank you.

1 Like

The DevForum isn’t the place to learn advanced mechanical mathematics, and you’re definitely not going to find someone willing to teach you in the comments.

The course below looks to be a solid place to learn about kinematics, and you could probably get away with completing the course up to the first “checkpoint”.

http://www.robogrok.com/Robotics_1.php