Question

sin 2x делить на sin 7x = 1
Помогите :с

Answer 1

sin2x=sin7x  sin7x≠0⇒x≠πn/7
sin2x-sin7x=0
-2sin5x/2cos9x/2=0
sin5x/2=0⇒5x/2=πn⇒c=2πn/5
cos9x/2=0⇒9x/2=π/2+πn⇒x=π/9+2πn/9