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