[/quote]
,
of positive integers satisfying the following two conditions:
,
is in 
,
and 
;
such that 
is not divisible by 
.
?
then
where 
Also, 
and 
is largest real root of the equation
then 
Equality holds iff 
and any cyclic permutations.
be a triangle, and let 
and 
be points on segment 
symmetric with respect to the midpoint of 
denote the circle passing through 
.
denote the circle passing through 
.
)
.
and 
,
[list=a]
and 
,
satisfying this equation.
denotes the greatest common divisor of positive integers 
and 
.
that are each continuous and last on a certain time interval. Each event has a weight 
However, one can only choose to attend activities that do not overlap with each other. The goal is to maximize the sum of weights of all activities attended. Prove or disprove that the following algorithm allows for an optimal selection:
consider 
the sum of 
over all 
such that 
and 
If there are multiple such events, delete the event with the minimal weight.
spheres centered at 
,
and 
and 
,
points 
outside of 
as the number of sets 
such that the midpoint of 
lies entirely inside of 
for 
,
is called frameable if it is possible to draw a regular polygon with 
are frameable.
is not frameable.
is frameable.
,
with integer coefficients such that 
divides 
for every positive integer 
with the smaller base 
and 
.
.
such that
for all real numbers 
satisfying the equation
has circumcenter 
.
and 
intersect at 
,
and 
intersect at 
and 
and 
intersect at 
.
are similar(with vertices in that order), than 
is an odd integer. Each candidate is evaluated by each judge as either pass or fail. Suppose that each pair of judges agrees on at most ![\[{\frac{k}{m}} \geq {\frac{n-1}{2n}}. \]](http://latex.artofproblemsolving.com/3/8/7/387c8824b28f6422306e3c25b34fccb0a841f4cd.png)
Y by Mango247
Let 
be an isosceles triangle with 
. Points 
are considered on 
, respectively, such that 
and that the quadrilateral 
is a parallelogram. The perpendicular line to 
drawn by 
intersects the perpendicular bisector of 
at 
. Prove that 
.
be an isosceles triangle with 
. Points 
are considered on 
, respectively, such that 
and that the quadrilateral 
is a parallelogram. The perpendicular line to 
drawn by 
intersects the perpendicular bisector of 
at 
. Prove that 
.This post has been edited 1 time. Last edited by parmenides51, Jun 15, 2020, 5:45 PM
,
,
,
,
is cyclic. Also 
and 
,
,
and 
,
is cyclic as well and the conclusion follows since 
