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x in (-oo:+oo)
-3*sin(6*x+3.14/2) = 0
sin(6*x+3.14/2) = 0
sin(6*x+3.14/2) = 0 <=> 6*x+3.14/2 = pi*k_1 i k_1 naleu017Cy do I
t_1 = pi*k_1
6*x-t_1+3.14/2 = 0
6*x-t_1+1.57 = 0 // - 1.57-t_1
6*x = -(1.57-t_1) // : 6
x = (-(1.57-t_1))/6
x = (t_1-1.57)/6
x = (pi*k_1-1.57)/6 i k_1 naleu017Cy do I
-3*sin(6*x+3.14/2) = 0 <=> -3 = 0 or -3*sin(6*x+3.14/2) = 0 <=> sin(6*x+3.14/2) = 0
x = (pi*k_1-1.57)/6
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