2sinx - sinx/cosx = 0
(2sinxcosx - sinx)/cosx = 0 , multiply by cosx
2sinxcosx - sinx = 0
sinx(2cosx - 1) = 0
so sinx = 0 or cosx = 1/2
I am sure you can finish it from here.
Solve the given triginometric equation analytically
2 sinx = tanx
2 answers
2sinxcosx+cosx=0