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t in (-oo:+oo)
cos((pi/6)*t) = 0
cos((pi/6)*t) = 0 <=> (pi/6)*t = pi*k_1+pi/2 i k_1 należy do I
t_1 = pi*k_1+pi/2
(pi/6)*t-t_1 = 0
(pi/6)*t-t_1 = 0 // + t_1
(pi/6)*t = t_1 // : pi/6
t = t_1/(pi/6)
t = pi*k_1+pi/2/(pi/6) i k_1 należy do I
t = pi*k_1+pi/2/(pi/6)
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