Sin3x*cos3x=-1/2

sinx-sin3x+sin5x=0

решите уровнение

Sin (3x) * cos (3x) = - 1/2

sin6x=-1

6x=-π/2+2πn, n ∈ Z

x=-π/12 + πn/3, n ∈ Z

sin (x) + sin (5x) - sin (3x) = 0

sin (x) - 2sin (x) * cos (4x) = 0

sin (x) (1-2cos (4x)) = 0

sin (x) = 0

x=πk, k ∈ Z

cos (4x) = 1/2

4x=±π/3+2πn, n ∈ Z

x=±π/12+πn/2, n ∈ Z