Sin3x=cosx-sinx решите плиз
Sin3x+sinx=cosx 2sin2xcosx-cosx=0 cosx*(2sin2x-1)=0 cosx=0⇒x=π/2+πk,k∈z sin2x=1/2⇒2x=π/6+2πk U 2x=5π/6+2πk⇒x=π/12+πk,k∈z U x=5π/12+πk,k∈z