MathDB

Chisinau MO p50 1949-56 VIII-IX ctg(a/2)}> 1 + ctga for 0 <a < pi /2

Source:

March 15, 2021

trigonometryinequalitiesalgebra

Problem Statement

Prove the inequality:

ctg \frac{a}{2}> 1 + ctg a

for

0 <a <\frac{\pi}{2}