Polynomials and their shift with all real roots and in common
by Assassino9931, Mar 30, 2025, 1:12 PM
We call two non-constant polynomials friendly if each of them has only real roots, and every root of one polynomial is also a root of the other. For two friendly polynomials
and a constant
, it is given that
and
are also friendly polynomials. Prove that
.





This post has been edited 1 time. Last edited by Assassino9931, Yesterday at 1:13 PM
Thanks u!
by Ruji2018252, Mar 30, 2025, 11:07 AM
VERY HARD MATH PROBLEM!
by slimshadyyy.3.60, Mar 29, 2025, 10:49 PM
Let a ≥b ≥c ≥0 be real numbers such that a^2 +b^2 +c^2 +abc = 4. Prove that
a+b+c+(√a−√c)^2 ≥3.
a+b+c+(√a−√c)^2 ≥3.
Another "OR" FE problem
by pokmui9909, Mar 29, 2025, 10:16 AM
Let
be the set of real numbers. Find all functions
that satisfy the following condition. Here,
is the function obtained by composing
times, that is, 
(Condition) For all
, 






(Condition) For all


This post has been edited 1 time. Last edited by pokmui9909, Saturday at 10:25 AM
Inspired by old results
by sqing, Mar 27, 2025, 12:35 PM
Let
and
Prove that
Let
and
Prove that







This post has been edited 1 time. Last edited by sqing, Mar 27, 2025, 12:44 PM
The reflection of AD intersect (ABC) lies on (AEF)
by alifenix-, Jan 27, 2020, 5:00 PM
Let
be a triangle. Distinct points
,
,
lie on sides
,
, and
, respectively, such that quadrilaterals
and
are cyclic. Line
meets the circumcircle of
again at
. Let
denote the reflection of
across
. Show that
lies on the circumcircle of
.
Proposed by Ankan Bhattacharya

















Proposed by Ankan Bhattacharya
This post has been edited 2 times. Last edited by alifenix-, Jan 27, 2020, 7:03 PM
Similar triangles and complementary angles
by math154, Jul 2, 2012, 3:16 AM
Let
be an acute triangle with circumcenter
such that
, let
be the intersection of the external bisector of
with
, and let
be a point in the interior of
such that
is similar to
. Show that
.
Alex Zhu.











Alex Zhu.
x is rational implies y is rational
by pohoatza, Jun 28, 2007, 7:24 PM
For
let
be the number whose
-th digit after the decimal point is the
-th digit after the decimal point of
. Show that if
is rational then so is
.
Proposed by J.P. Grossman, Canada







Proposed by J.P. Grossman, Canada
USAMO 1995
by paul_mathematics, Dec 31, 2004, 1:01 PM
Given a nonisosceles, nonright triangle ABC, let O denote the center of its circumscribed circle, and let
,
, and
be the midpoints of sides BC, CA, and AB, respectively. Point
is located on the ray
so that
is similar to
. Points
and
on rays
and
, respectively, are defined similarly. Prove that lines
,
, and
are concurrent, i.e. these three lines intersect at a point.














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