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8sin(3x)*cos(6x)*cos(3x) = √2
4*2*sin(3x)*cos(3x)*cos(6x) = √2
4*sin(6x)*cos(6x) = √2
2*2*sin(6x)*cos(6x) = √2
2*sin(12x) = √2 |:2
sin(12x) = √2/2
12x = π/4 |:12
xo = π/48
x = π/48 + 1/6kπ
lub
x = π/12-π/48 + 1/6kπ