AoPS Academy
[/quote]
, do not answer with "
is a solution" only. Either you post any kind of proof or at least something unexpected (like "
is the smallest solution). Someone that does not see that is a solution of the above without your post is completely wrong here, this is an IMO-level forum.
, let 
be the foot of the perpendicular from 
to line 
. Point 
lies inside triangle such that 
and 
. The line through perpendicular to like 
meets the circle with diameter at points 
. Prove that 
such that there exist integers 
so that the polynomial 
has 4 distinct roots in the interval 
?
?
integers where 
. Show that there exists at least three positions 
such that ![$gcd(p[i], p[i+1])=1$](http://latex.artofproblemsolving.com/f/b/b/fbb304fb8ebdb8987edc830234698de2dc7a28a2.png)
(here ![$p[i]$](http://latex.artofproblemsolving.com/0/b/6/0b6cc7e1108ab6b64f3a644a3b28891f826b3bea.png)
refers to the -th position integer in the permutation)
be not cyclic and haves edges not parallel to each other.
as the intersection of the tangent line at 
with respect to circle 
and the 
-symmedian with respect to triangle 
and 
as the intersection of lines 
and 
, where all indexes taken cyclically.
, 
, 
, and 
are collinear.
(i know 
well). i want to study so if you guys have some easy or normal problems please send me
and 
. At each step, it is allowed to add to one of the polynomials and to multiply another one by the polynomial 
. Can the polynomials become equal at some point?
of degree . Sasha wants to guess it (knowing ). During a turn, Sasha can name a certain segment ![$[a;b]$](http://latex.artofproblemsolving.com/0/0/6/0066f4b2714f88cdaf883b00f877aa1355b7f9ef.png)
and Maxim will give in response the maximum value of on the segment . Will Sasha be able to guess in a finite number of steps?
and 
Prove that
Let 
and 
Prove that
not isosceles, the incircle 
. 
is the intersection of with 
. 
is the projection of onto 
. 
cut at the second point . 
is the projection of onto 
. 
cut at the second point 
respectively. Prove 
are collinear
and 
lie on the lateral sides 
and respectively of an isosceles triangle in such a way that 
. Let 
be the reflection of about 
. Prove that the line 
passes through the incenter of .
be bisector of 
. Take 
reflection of 
about 
and: 
, which proves that 
are concurrent, and 
being angle bisectors, we are done.
be a triangle with incenter 
two points of 
s.t. 
is the intersection of the parallel to through and the parallel to 
through 
.
are collinear.
be the infinity point of 
; 
be the infinity point of 
; Let 
be the infinity point of 
we get are collinear .
thus 
besides
moves linearly on , then also and move linearly. So it suffices to consider the two extremal cases 
and 
. and move on are parallel to each other (which fortunately is true in this case). Otherwise, all such lines are not guaranteed to pass through a fixed point.
is an integer. Prove that 
are integers.
in natural numbers m and n.
![\[
v_p(n!) \leq \frac{n}{p - 1}
\]](http://latex.artofproblemsolving.com/5/7/c/57ca4d0a6532fb4b97687a97b9c1fb35ad02b9f2.png)
and 
,
and the condition on the angles shows that 
is the angular bisector of 
;
,
,
,
,
,
.