[/quote]
,
:
be reals such that 
and 
Prove that
Where 
Prove that: 
is the sum of 
square numbers
Let 
and 
is the sum of 
is the sum of 
,![\[\frac{a}{b}+\frac{b}{c}+\frac{c}{d}+\frac{d}{a}\geq 4+\frac{8(a-c)^2}{(a+b+c+d)^2}.\]](http://latex.artofproblemsolving.com/7/b/6/7b6e32d32d89ca058a06974e7276f0a5874d90a7.png)
such that 
that satisfy the equation
with incenter 
.
at 
be points on the side BC such that 
and 
,
and 
be the incenter of triangles 
and 
,
.
,
,
,
are odd primes and![\[2^ap^b=(p+2)^c-1.\]](http://latex.artofproblemsolving.com/5/8/5/58518a8ebed14836b72af743ff100eae2efba5e2.png)
we have 
.
.
be a cyclic quadrilateral. The point 
the intersection of 
.
be the reflection of 
.
concyclic.
. Prove that: 
Y by
From the point 
outside the circle, the tangents 
and 
of the circle are drawn, as well as the secant 
, which intersects the circle also at the point 
(
lies on the circle, les on the segment ). The line parallel to passing through point 
intersects the lines 
and 
at points 
and 
, respectively. Prove that 
.
outside the circle, the tangents 
and 
of the circle are drawn, as well as the secant 
, which intersects the circle also at the point 
(
lies on the circle, les on the segment ). The line parallel to passing through point 
intersects the lines 
and 
at points 
and 
, respectively. Prove that 
.This post has been edited 1 time. Last edited by parmenides51, Aug 17, 2021, 12:37 PM
