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cos((5/3)*x) = 0
cos((5/3)*x) = 0 <=> (5/3)*x = pi*k_1+pi/2 i k_1 należy do I
t_1 = pi*k_1+pi/2
(5/3)*x-t_1 = 0
5/3*x-t_1 = 0 // + t_1
5/3*x = t_1 // : 5/3
x = t_1/5/3
x = 3/5*t_1
x = 3/5*pi*k_1+pi/2 i k_1 należy do I
x = 3/5*pi*k_1+pi/2
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