Given 2sinb = sin (2a + b), find the value of Tan (a + b) to tanb

Given 2sinb = sin (2a + b), find the value of Tan (a + b) to tanb

2sinb=sin(2a+b)
Let SINB = 1 / 2
sin(2a+b)=1
b=30,2a+b=90
a=30
tan(a+b)/tanb=tan60/tan30=3