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

Feb2313 09:23 AM
micromass

1 
37,175 
Can someone show me why the derivative of
k(x) = cot x
Is
k'(x) = cosec^2 x
And not

Aug610 04:52 AM
tomwilliam

7 
1,636 
Hello all, this is my first post here.
Got into a debate over when a deck of cards drawn without replacement is...

Aug610 03:26 AM
schwanky7

7 
11,178 
I am new to Calculus. I know that the rate of change in some thing is called it's derivative or we differentiate...

Aug510 04:01 PM
Bohrok

2 
1,173 
I've been working through the book The Story of i(sqrt of 1). It's kinda like a story with a lot of Math. The first 2...

Aug510 03:44 PM
Kreizhn

3 
1,184 
Adults need 2.5" between Eyes, but this is too far for kids eyes.
Adults = 2.5" = 52 Pixels difference = left eye 26...

Aug510 02:13 PM
Telushomey

4 
1,994 
I read through that 800 something page Dover book on differential equations, but I feel like I haven't had enough...

Aug510 11:09 AM
gobberpooper

3 
4,698 
1) Is there any way to find integer solutions for a linear equation ax+by=c, with a,b,c known and without having an...

Aug510 08:59 AM
smslca

2 
2,187 
ok this seems like a predominantly maths problem but i need it for a little project of mine related to classical...

Aug510 05:59 AM
Ketsha

4 
1,033 
I am wondering if anyone can tell me how to get Mathematica to recognize the product of two variables so that I can do...

Aug410 09:00 PM
jgm340

1 
1,210 
Hello guys. I'm trying to create a formula here, and I got stuck at this step, where I have to calculate the following...

Aug410 05:34 PM
LucasGB

9 
1,441 
Okay so this seems like a very simple problem to me but I can't figure it out so I definitely need some help. I'm not...

Aug410 05:08 PM
Mark44

48 
14,791 
I'm going to guess that mine isn't the first "speeding ticket" question ever posted here, but I'm having a tough time...

Aug410 04:10 PM
MisterM

2 
1,559 
Hello. Up until this point I have been solving this numerically, by propagating the state vectors and checking for a...

Aug410 02:34 PM
Mentallic

12 
1,556 
Everyone knows by now that a conic section is the figure formed when a plane intersects a right circular cone. Most...

Aug410 02:26 PM
CarlisleLes

4 
1,453 
This is going to be a weird question, but in textbooks when we're given the two spaces R^n and R^m, and they say...

Aug410 07:11 AM
HallsofIvy

4 
1,438 
Hello,
I apologize in advance for the odd nature of this question. Can anyone recommend any renowned old (circa...

Aug310 05:03 PM
awkward

2 
3,013 
Being a 4th year mech. engineering student, you would think I could figure this out. But, for some reason, I can't...

Aug310 09:12 AM
Mute

2 
2,017 
I am doing a summer project where i have got lab data of fluxuating flow patterns in a flume, the data i have plots...

Aug310 04:36 AM
nemesis24

7 
1,502 
If we know that x + y = z, can we find out what xy = ?
This is what I did. Say z = 5
x + y = z
x + y = 5
y = 5...

Aug310 12:57 AM
CRGreathouse

4 
1,046 
So for a while i have been wondering if there was a way to find a point a certain distance along a linear function, so...

Aug310 12:21 AM
physicisTboB

17 
25,869 
Hi
For small angles or points near the vertex of a parabola we can approximate a parabolic surface with a circle....

Aug210 06:37 AM
HallsofIvy

1 
1,820 
Hi,
I want to sum the following expression
R(m)=sum(u(k)*u(mk1)) for k=0 to m1
in matlab for each mth ...

Aug210 04:13 AM
anant

0 
861 
what's the general solution for x in the following equation
x=cN^{\left(\frac{1+x}{1x}\right)}
i could...

Aug110 09:08 PM
Mentallic

6 
1,421 
Hi!,
I'm well into the world of computer graphics. Love to say it was great but well, it isn't.
I would like to...

Jul3110 10:22 PM
Adder_Noir

1 
763 
Can someone help me with this sequence?
2 0 2/27 0 2/125
If I only look at the odd numbers it's: 2/n^3
...

Jul3110 05:22 AM
HallsofIvy

6 
1,137 
I don't know the answer to these questions:
1/120th of a second = how many milliseconds?
1/240th of a second = how...

Jul3010 03:19 PM
Telushomey

2 
1,566 
Can someone help me with this sequence?
1 4 1 16 1 36
If I only look at the odd numbers...

Jul3010 01:27 PM
arildno

13 
1,951 
How do you get this:
\int_{\infty}^{\infty}e^{(ax^2+b/x^2)}dx = \sqrt{\frac{\pi}{a}}e^{2\sqrt{ab}}
I've been...

Jul3010 10:40 AM
techmologist

5 
1,095 
What do people think about Lang's textbooks?
I am learning Complex Analysis for the first time from Lang....

Jul2910 10:10 PM
snipez90

1 
4,230 
Why is 0! = 1?

Jul2910 03:57 PM
alxm

8 
1,004 
Can someone help me with this? I don't know how to begin
I(n) = integral 1/(1+x^2)^n dx with n ∈ ℕ0
Than: ∀ n ∈...

Jul2910 08:00 AM
arildno

12 
2,050 
Is this correct:
integral: 1/(1+cos(x)+sin(x)) dx
t = tan(x/2) > x = 2arctan(t) > dx = 2/(1+t^2) dt
...

Jul2910 04:09 AM
arildno

1 
770 
I try to solve the integral 1/(1+x^3) dx , but I got stuck
Now I got as solution:
(1/3) ln(x+1)  (1/6) ln(x^2...

Jul2910 02:19 AM
Alexx1

2 
818 
I'm reviewing limits to tutor a student in precalc and came across a problem.
The conjugate method multiplies the...

Jul2910 01:17 AM
charley076

2 
5,540 
Many authors and lecturers use the word approximate.
It is not mathematically to say something is close to another......

Jul2810 01:57 PM
Mark44

1 
995 
I'm working on a project where I have two equations with three variables. I know that the solution will be a line;...

Jul2810 11:10 AM
sshzp4

2 
4,077 
Hi all
How hard is it to write a symbolic laplace solver ?
(I am aware that there are many available out
there,...

Jul2810 09:25 AM
prabhu2288

1 
1,626 
Hello,
What is \frac{d}{dx}K_v\left(f(x)\right)=?
Thanks in advance

Jul2710 09:23 PM
skyspeed

6 
8,359 
I'm learning Algebra (the basic and foundation of Math) 'cause I stink. Now I'm just doing some review from the...

Jul2710 08:38 PM
Edin_Dzeko

2 
962 
To determine whether schools are increasing the amount of students meeting or
exceeding standards, I obtained a MEAP...

Jul2710 07:29 PM
lcary

0 
626 