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x in (-oo:+oo)
x*((3*sin(4*x))/8) = 0
x = 0
(3*sin(4*x))/8 = 0
(3*sin(4*x))/8 = 0 // * 8
3*sin(4*x) = 0
sin(4*x) = 0
sin(4*x) = 0 <=> 4*x = pi*k_1 i k_1 naleu017Cy do I
t_1 = pi*k_1
4*x-t_1 = 0
4*x-t_1 = 0 // + t_1
4*x = t_1 // : 4
x = t_1/4
x = pi*k_1/4 i k_1 naleu017Cy do I
3*sin(4*x) = 0 <=> 3 = 0 or 3*sin(4*x) = 0 <=> sin(4*x) = 0
x*((3*sin(4*x))/8) = 0 <=> x = 0 or x*((3*sin(4*x))/8) = 0 <=> (3*sin(4*x))/8 = 0
x in { 0, pi*k_1/4 }
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