Pixel

Which variables do you not understand?

CASIO FX-991ES PLUS Manual - Page E-18 shows you how to input complex numbers. I am unsure about inputting them into a matrix however. Good luck.

You are taking a limit so you can avoid [math] \frac{0}{0} [/math]. Remember [math] h \rightarrow 0 [/math] means that [math] h [/math] is approaching (or tends to) [math] 0 [/math] and should not be simply substituted in. What you must remember is that you are trying to find the gradient of a tangent slope at a single point. The general idea behind what you are doing is: You need to make a secant line between two different points, if they were the same point you could not find the slope as you would have [math] \frac{0}{0} [/math]. This however does not give us an accurate tangent slope. To overcome this problem you let the distance between those two points approach 0 (so the slope of the secant line gets ever closer to the tangent slope you are looking for), and that is where taking the limit helps us. I suggest, as did the tree; go back and learn limits fully before trying to tackle the chain rule.

Hi all, just joined up this evening. Currently studying towards a masters in theoretical physics. Just wanted to sign up and chat to some like-minded people

http://www.youtube.com/watch?v=EEEzbFxEbB8

There is a documentary called "Absolute Zero" that is very good. Another is "The Strange New World of Nanoscience" narrated by Stephen Fry. It's not terribly long, but still good. Last that I can think of is "Infinite Secrets of Archimedes". Which is all about a manuscript that was only found fairly recently (containing some interesting math from Archimedes).