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6*cos(x/4) = 0
cos(x/4) = 0
cos(x/4) = 0 <=> x/4 = pi*k_1+pi/2 i k_1 należy do I
t_1 = pi*k_1+pi/2
x/4-t_1 = 0
1/4*x-t_1 = 0 // + t_1
1/4*x = t_1 // : 1/4
x = t_1/1/4
x = 4*t_1
x = 4*pi*k_1+pi/2 i k_1 należy do I
6*cos(x/4) = 0 <=> 6 = 0 or 6*cos(x/4) = 0 <=> cos(x/4) = 0
x = 4*pi*k_1+pi/2
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