Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:24 AM
micromass

1 
40,028 
d/dx (sin1x) = \frac{1}{\sqrt{1x2}}
But using chain rule, I got:
dy/dx = sin2xcosx
Why???

Sep1711 10:40 AM
HallsofIvy

2 
736 
Hi, the AP test is approaching and I'm struggling with these two Calculus questions and need some guidance. If you can...

Apr1608 12:06 AM
ice109

1 
4,496 
I have a relation xy=c2 , if i apply implicit differentiation to both sides i get dy/dx =y/x , but if i write the...

Oct109 10:39 PM
quasar987

2 
2,446 
I was wondering if anyone knows of an example where f and g are two functions that do not have limits at the real...

Nov109 08:06 PM
l'Hôpital

1 
1,674 
looking for 2 functions f,g:X > X that are discontinuous but their composition gof continuous...

Nov1704 07:30 AM
matt grime

1 
794 
Hi guys.. i was studying calculus and i found some problems in solving these two questions.. would you please help me...

Oct2207 09:36 PM
keltix

8 
2,273 
I need help on these two integration questions:
1.
(x^2 16)/(2x + 8) dx
2.
1/(1+9x^2) dx

May207 01:55 PM
Joza

4 
1,412 
Hi all,
I need help.
What is the difference between
\int_{0}^b x^2 dx

Apr1008 01:20 PM
sutupidmath

2 
1,130 
Two basic limit problems just solve the limit if it exists. I know the answers but I don't understand why the answers...

Feb609 11:04 PM
Iron_Brute

2 
690 
Aloha!
This is my first post, and I hope that I am posting in the correct area...
I need help with a math...

Feb2112 01:05 PM
T.A. Zenaide

6 
1,354 
Find the Limits
1. lim 312
x>11+
2. lim (x^2...

Dec406 07:55 AM
dontdisturbmycircles

8 
1,116 
so x(1) := 8, and x(n + 1) = 1/2(X(n)) + 2. show that it is bounded and monotone, and find the limit.
so I claim...

Feb1505 06:46 AM
HallsofIvy

3 
1,175 
1. In the navier stokes equation we have the term (\vec{u} \bullet∇)\vec{u}
If I have \vec{u} = f(r)(y,x) with r=...

Feb1313 06:18 PM
ericm1234

0 
491 
This was given as a problem...
\frac{2x+y}{x3y}=4
Now, if you just solve it as is, using implicit...

Apr1204 10:40 AM
matt grime

6 
856 
I have few questions about extrema of fonctions of two variables. It is written in my textbook: "At a local maximum,...

Dec1804 01:01 PM
Hurkyl

5 
1,815 
1. Write out the vector V=2i+3j at the point (x,y) = (1,2) in terms of the unit vectors in plane polar coordinates. Do...

Apr2104 01:26 PM
vadik

3 
1,159 
I was playing around with euler's formula the other day and found this odd proof which says 2ipi=0. I know this is...

Jan909 02:38 PM
adriank

6 
1,561 
Hi All,
I'm working on coding some 2D interpolation techniques. With wikikepdia's help, I've managed blinear...

May3112 08:30 AM
RH10

4 
944 
Hey everybody,
\int_{B(0,\epsilon)} log \frac{1}{r} \ dxdy \ = \ \int^{2\pi}_{0} d\theta \ \int^{\epsilon}_{0} log...

Sep2008 08:14 AM
HallsofIvy

4 
4,332 
Hi,
can someone suggest me some reference (possibly available on the web) where to find some details on the...

Mar509 10:26 AM
thefly

0 
4,397 
Hi.
I'm new to vector physics, and I'm trying to write a function to predict the rebound vectors of two circles...

Sep508 02:38 PM
realgreatbass

0 
3,599 
I'm studying for a reexamn in a physical measuring techniques course that includes some fourier analysis. On old...

Aug1811 01:07 PM
hadoque

0 
731 
Hi there,
I'm new to this community, but I think I need some help. Have been trying to analytically compute the 2D...

Apr611 01:50 AM
sooke

0 
1,380 
w = 1 + sigma(xy)*log(1w);
u = sqrt((1w)*(1+w));
v = u*sin(phi); u = u*cos(phi);
u, v and w...

May2110 06:00 PM
ireland01

0 
5,429 
I am looking for help with the following integral
A = \int dx \int dy \exp(a (x+y)^2 +ib(xy)) sinc(cx+dy)...

Sep605 10:08 PM
beautiful1

2 
9,949 
I was trying to do 2d Fourier transform of 1/k^2 in 2d. I know that answer is log r. I am not able to derive it.
...

Dec612 11:22 PM
navaneethjnc

0 
653 
Does anybody out there know what the Laplacian is for two dimensions?

Jul1905 11:32 PM
MalleusScientiarum

9 
8,221 
My function is;
y(x,s)= 1(cos*gamma(s1))/(1+x^2)^(s1)/2
varible x will have range from 0 to 10. At one time...

Jan3112 12:19 PM
aredy29

0 
1,366 
:confused:
hi, this will be my first post on the forum, although i in the past have looked over it!
um, this is...

Oct2409 11:51 PM
mbsl5

12 
7,941 
so to find when a graph is concave up or down you can use the 2nd derivative rule, but what happends if we have f"(x)...

Nov308 06:39 PM
Megz27

4 
1,681 
f(x)=x/x^2+1
f'(x)= 1x^2/(x^2+1)^2
But then I can't seem to work through taking the 2nd derivative, perhaps I am...

Aug2508 09:33 AM
CompuChip

1 
1,188 
Can some on pleases explain this too me. I have an AP book, and i am to do a few problems out of it for class, and but...

Sep2304 02:14 PM
JasonRox

9 
6,516 
The formula given by my instructor for a Taylor Series approximation of the second order at point (a,b) is f(a,b) +...

Nov1610 09:19 AM
HallsofIvy

1 
3,511 
Hi.
I came across this page on Wikipedia regarding the 2nd derivative test. It says that if the determinant of the...

Jan1109 05:28 PM
BackEMF

5 
5,399 
I want to calculate what body2 must have a mass. The body2 must zero trajectory and speed. Bodies m1 and m2 are...

Apr1411 03:41 PM
asteorit1

2 
834 
How can I show that
1+\frac{n}{1!}+\frac{n(n1)}{2!}+\frac{n(n1)(n2)}{3!}+...= 2^{n}
This comes from proving...

Aug907 10:36 PM
theperthvan

2 
1,357 
3 + 2 log (base 2) X = log (base 2) y
how can this show, that y = 8X squared??? Please help! :confused:

Feb505 09:55 AM
arildno

4 
1,137 
I'd like to delete it.

Apr2004 02:41 PM
dapet

0 
2,463 
For a kinematic problem I obtained the following equations:
p1= r*sin(theta_c)  d*cos(psi_a)*sin(theta_a)+c1...

Feb2311 02:49 PM
azizz

2 
749 
(1) \alpha(tt_{0})=\int_{R_{0}}^{R(\Theta)}\frac{du}{u\sqrt{a^ 2u^2}}
(2)...

Oct704 07:21 AM
HallsofIvy

4 
1,146 