MathDB

5

Part of 2014 Albania Round 2

Problems(1)

angles satisfying an equation

Source: Albania Round 2, Grade XI 2014 P5

11/14/2018
Prove that if the angles α\alpha and β\beta satisfy sin⁡(α+β)=2sin⁡α\sin(\alpha + \beta) = 2 \sin \alpha, Then α<β\alpha < \beta
geometry