If y=lnx, dy/dx=1/x (Proof - Alternative Short Cut) Video by: Tiago Hands (https://www.instagram.com/tiago_hands/) Instagram Resources: Mathematics Proofs (Instagram): https://www.instagram.com/mathematics.proofs/ Scientific Quotes (Instagram): https://www.instagram.com/scientific.quotes/ ... https://www.youtube.com/watch?v=yP9l4QItbGY

I will show you how to get the equation for the circumference of a circle (C=πd) using the constant of proportionality and the fact that when the diameter of a circle is 1, the value of its circumference is pi. Please note: This video is strictly NOT about deriving the value of pi or searching for the value of pi. This is NOT a proof for finding pi. Do not be mistaken. However, what you do need to know is that in nature - we will find that if the diameter of a circle is 1, its circumference is pi (an irrational number). I know that many of you might want a proof for pi, but this is not the purpose of this video. This video simply demonstrates a useful way to get the equation of the circumference of a circle - if in trouble in an exam. If you know that when the diameter of a circle is 1 - then its circumference is pi, plus you understand how to use the constant of proportionality - you can't get lost. The technique that I'm using can also help you come up with different formulas as well. All comments are welcome, and thanks to your feedback - I have changed the title of this video and have provided a better explanation as to the message I'm trying to convey. Your views count and enliven and enrichen this space. [The title of this video and its description was changed on the 29.10.2018 due to complaints in the comments section.] ... https://www.youtube.com/watch?v=j4U-iAVEqK8