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2*sin(x/3)*cos(x/3) = 0
2*sin(x/3) = 0
sin(x/3) = 0
sin(x/3) = 0 <=> x/3 = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
x/3-t_1 = 0
1/3*x-t_1 = 0 // + t_1
1/3*x = t_1 // : 1/3
x = t_1/1/3
x = 3*t_1
x = 3*pi*k_1 i k_1 należy do I
2*sin(x/3) = 0 <=> 2 = 0 or 2*sin(x/3) = 0 <=> sin(x/3) = 0
cos(x/3) = 0
cos(x/3) = 0 <=> x/3 = pi*k_2+pi/2 i k_2 należy do I
t_2 = pi*k_2+pi/2
x/3-t_2 = 0
1/3*x-t_2 = 0 // + t_2
1/3*x = t_2 // : 1/3
x = t_2/1/3
x = 3*t_2
x = 3*pi*k_2+pi/2 i k_2 należy do I
2*sin(x/3)*cos(x/3) = 0 <=> 2*sin(x/3) = 0 or 2*sin(x/3)*cos(x/3) = 0 <=> cos(x/3) = 0
x in { 3*pi*k_1, 3*pi*k_2+pi/2 }
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