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