Math Forum / Mathematics / Undergraduate Math / November 2007

Find the rational x
if tan(x)=(18*10^v)/π
(π is 3,14...)

Thanks much for the responses.
The examples I tried and this may an error, were the square roots of
integers that were not perfect square....square root(sq)of 2, sq of 3, sq
of 5, and so on up to about 35.

tred many examples but counter to what is statedd in Mathematical
Reasoning by Ted Sundstom 2nd ed. , i coulnt find any irrational numbers
such that the sum of two irrational numbers could be a rational number.
Email me at m[nospam]haun@theworld.com

I started to read the textbook,
 R. L. Rardin, Optimization in Operations Research, Prentice-Hall, 1997
Is there any way to find code written by GAMS or else.

This is probably a standard trick question seen in exams in calc 101
classes across the country.
derivative of x^x
and no, it's not (x)x^(x-1)

LET a=b=c=0
ab=c
a=c/b which fits
Thus 0=0/0

hi, all,
 run into one geometry problem: I have two 3-D Cartesian systems, A and B. they share the same original. and they have the same scale.
 (2,3,3) in B system is the same direction as (118,2090,1000)in A system; then what is the direction in B corresponding to (89,2600 ...

I am coursing Set Theory class I need extra help, and I was trying found good book about Set Theory.
the topics are:
functions,
operations,

I have two groups of items (group of T's and group of I's) , this T's and I's are connected between them by a relation (for example T knows I , I knows T)which i want to divide into many sub groups (optimal sub groups) by using two rules only
1)Each T can be present in only one ...

A small weight W is supported by two strings of lenght 1 metre and 1.2 metres from two points 1.4 metres apart on a horizontal ceiling. How far below the ceiling is W ?

This is the definition of partial order on wikipedia:
"A partial order is a binary relation "≤" over a set P which is reflexive, antisymmetric, and transitive, i.e., for all a, b, and c in P, we have that:
a ≤ a (reflexivity);
if a ≤ b and b ≤ a then a = b (antisymmetry);

email at epictheman@gmail.com for futher details
plz mail and donot post replies here
List of Solution manuals:
Engineering Circuit Analysis 6Ed - Hayt Solutions Manual

Someone could help me resolve the system below using Gaussian Elimination ?
[system]
x  + y + z  = 0
x  - y + mz = 2

could someone explain to me in simplest terms how to construct an
isomorphism between two cyclic groups? the textbook i am using says
that i need to fix a generator of one and send it to a generator of
another. how would can i find a generator of a group and send it to

I'm working through the series problems in Calculus Apostol. Ok until 10.20
exercise 51:
Given a convergent series sum(n=1..inf, An) where An >=0. Prove
sum(n=1..inf, (An)^1/2*n^-p) converges if p>1/2 .