[/quote]
,
be an acute triangle. Let 
be a point on side 
be a point on side 
such that lines 
and 
are parallel. Let 
be an interior point of 
.
and 
meet side 
and 
,
and 
.
and 
intersect at a point 
.
,
are collinear.
.
and 
,
as the greatest exponent 
such that 
divides 
.
and infinitely many 
such that 
.
and 
.
is given. Let 
to 
be the intersection point of 
lies on the arc 
.
.
be a trapezium inscribed in a circle 
with diameter 
. The circle with center 
meets 
and 
(where 
at 
.
is perpendicular to 
.
![\[ x + y^2 = p^m \]](http://latex.artofproblemsolving.com/e/c/f/ecf553036f22327dd457dc06611b6bc1b0ef072c.png)
![\[ x^2 + y = p^n \]](http://latex.artofproblemsolving.com/5/b/d/5bd672934a395aabd6865ca4b50d8da75c0fe07e.png)
For 
positive integers and 
being a prime.
and 
.
Equality holds when 
or 
.
at 
intersect again at 
.
Equality holds when 
intersect its circumcircle 
.
determine a triangle 
,
is relative to 
are concurrent at a point 
lie in the interiors of segments 
respectively, such that 
Let 
intersect 
at 
intersect 
at 
and 
are either parallel or coincide.
and 
.
Where 
Y by Adventure10, Mango247
Let 
be two circles such that the center of 
is on the circumference of 
. Let intersect each other at points 
. Let 
be two points on the circumference of such that 
is the diameter of it. Let lines 
meet for the second time at 
, respectively. Prove that 
where 
is the radius of .
be two circles such that the center of 
is on the circumference of 
. Let intersect each other at points 
. Let 
be two points on the circumference of such that 
is the diameter of it. Let lines 
meet for the second time at 
, respectively. Prove that 
where 
is the radius of .
.
.
since 
.
so that 
.
and 
is congruent since 
is isosceles so that 
.
