then prove \frac{1}{a+b}+\frac{1}{b+c}+\frac{1}{c+a}+\frac{1}{2}\cdot\frac{abc}{ab+bc+ca}\ge \frac{5}{3}.$$
and 
Prove that
Let 
Prove that
Let 
Prove that
Let 
Prove that
Y by
The measures of two angles of a triangle are equal to 
and 
, and the difference in the lengths of the larger sides is equal to 
cm. Find the length of the angle bisector of the triangle from the vertex of the third angle.
and 
, and the difference in the lengths of the larger sides is equal to 
cm. Find the length of the angle bisector of the triangle from the vertex of the third angle.This post has been edited 3 times. Last edited by parmenides51, Mar 25, 2021, 8:55 AM
Reason: typo mentioned in #4 corrected, a clear wording
Reason: typo mentioned in #4 corrected, a clear wording
for the angle symbol.
