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