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D( y )
cos((pi/3)*y) = 0
cos((pi/3)*y) = 0
cos((pi/3)*y) = 0
cos((pi/3)*y) = 0 <=> (pi/3)*y = pi*k_1+pi/2 i k_1 należy do I
t_1 = pi*k_1+pi/2
(pi/3)*y-t_1 = 0
(pi/3)*y-t_1 = 0 // + t_1
(pi/3)*y = t_1 // : pi/3
y = t_1/(pi/3)
y = pi*k_1+pi/2/(pi/3) i k_1 należy do I
y in {( -oo : +oo ) / < pi*k_1+pi/2/(pi/3) : pi*k_1+pi/2/(pi/3) >} i k_1 -> {I}
tan((pi/3)*y) = 0
tan((pi/3)*y) = 0 <=> (pi/3)*y = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
(pi/3)*y-t_1 = 0
(pi/3)*y-t_1 = 0 // + t_1
(pi/3)*y = t_1 // : pi/3
y = t_1/(pi/3)
y = pi*k_1/(pi/3) i k_1 należy do I
y = pi*k_1/(pi/3)
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