# Search results

1. ### The number e as a limit

Ok thanks it worked
2. ### The number e as a limit

I'm sorry if it takes time to respond, I have like several question to answer at the same and I must give this tomorrow lol Don't worry, I keep track of what I write on paper. I'll respond here if something I'm having a problem with.
3. ### The number e as a limit

Wait, what I just wrote was correct or not ? Am I in the right direction ?
4. ### The number e as a limit

OK but I'll have to take the natural logarithm right ?
5. ### The number e as a limit

1. Homework Statement I have lim of n > infinity (1+1/n)^n 2. Homework Equations 3. The Attempt at a Solution I know that I must use l'hospital rule and setting ln y = n ln (1+1/n) And after lim n ln (1+1/n) as n approaches infinity. After what do I do ?
6. ### Simple circle problem involving area and circumference

You obtian the radius. Btw why are you desesperate lol
7. ### Simple circle problem involving area and circumference

c=2*$\pi$*r
8. ### Simple circle problem involving area and circumference

How ? I don't know what there is to do next.
9. ### Simple circle problem involving area and circumference

Ok, I need to go now. I'll answer you when I get time. I'm very sorry :/
10. ### Simple circle problem involving area and circumference

It's asking me specifically to use limiting process. It's a kind of introduction to calculus problem, that's why. So I can't use the technique you showed me :/
11. ### Simple circle problem involving area and circumference

Yeah, but Im finding my derivatives with limits because it's what's asked in the problem. And it's derivative of what to time ? Area ?
12. ### Simple circle problem involving area and circumference

I don't understand the question. I will get the rate of change of the the area depending of the time we're talking about.
13. ### Simple circle problem involving area and circumference

Yeah, that's what it is.
14. ### Simple circle problem involving area and circumference

Yeah sorry about that : $$\frac{c}{2*\pi}$$
15. ### Simple circle problem involving area and circumference

Ok, so I evaluated the quotient and it gave me $$\frac{2c}{4*\pi}$$
16. ### Simple circle problem involving area and circumference

Ok, sorry for taking this long to continue this. Here : $$A=\frac{C^2}{4*\pi}$$
17. ### Finding polar form of complex number

Oh ok so its normal that I obtain two different values. Ok then, thank you!
18. ### Finding polar form of complex number

1. Homework Statement I have the following complex numbers : -3,18 +4,19i I must put it in polar form. 2. Homework Equations r=(a^2+b^2)^(1/2) cos x = a/r sin x = b/r 3. The Attempt at a Solution I was able to find with cos x = a/r that the x = 127,20 But when I do it with sin x = b/r I...
19. ### Simple circle problem involving area and circumference

Ok, I'm going to sleep for now. I'll continue tomorrow if it doesn't bother you.
20. ### Simple circle problem involving area and circumference

This : rate of change of area of circle = 1/2pi * Circumference Is this what you want ?
21. ### Simple circle problem involving area and circumference

Because the book that I'm using doesn't want us to use differentiation. I know that I could use these formulas, but I don't want too. (It's like we didn't learn them yet)
22. ### Simple circle problem involving area and circumference

Lim as h approaches 0 f(x+h)-f(x) divided by h I don'T understand the other question.
23. ### Simple circle problem involving area and circumference

1. Homework Statement A stone is thrown into still water, forming ripples which travel from the center of disturbance in the form of circles. If the circumference of the circle which bounds the disturbed area is 10 ft and the circumference is increasing at the rate of 3 ft. per second, how fast...
24. ### Finding the focus points of a hyperbola

Oh thank you for telling me !
25. ### Finding the focus points of a hyperbola

1. Homework Statement So I have the following hyperbola x^2/4 - y^2/4 = -1 I need to find the focus points of this hyperbola. What is some analytical way to do this ? Thank yoU! 2. Homework Equations I don't know... 3. The Attempt at a Solution I need some analytical way to be able to...
26. ### Conic section equation

ONE VERY LAST QUESTION. Is my equation in this form : y=(x^2)/2+1 in canonical form right ?
27. ### Conic section equation

Ok I was finally able to draw this cursed parabola. May it go to hell. thank you again for your help! This page helped me a lot : https://en.wikipedia.org/wiki/Rotation_of_axes
28. ### Conic section equation

Forget it, I was able to make it work. In fact, I found an easier way. I rotate one coordinate x and I replace it in my long equation to find the y. (Using worlfram to find the y)
29. ### Conic section equation

Hey can you try 1,3/2 for me please ? Im not sure if I did my part correctly. I obtian -(2)^(1/2)/4 although I dont think its correct
30. ### Conic section equation

Ok, I finally understand. We did a rotation which permitted me to identify a parabola. Now I must redo a rotation but inversly. so I found these equations : x=x'cos theta - y' sin theta Which seems to work because I obtained the correct vertex of -1/2^(1/2), 1/2^(1/2) Ill continue and see...