If 1+sinx+sin2x+sin3x+…+…∞ is equal to 4+23,0<x<π, then x=
π6
π4
π3 or π6
π3 or 2π3
We have,
0<x<π⇒sinx>0
Now,
1+sinx+sin2x+…x=4+23⇒11−sinx=4+23⇒sinx=1−14+23⇒sinx=3+234+23=32⇒x=π3 or, 2π3