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D( x )
tan(2*x) = 0
cos(2*x) = 0
tan(2*x) = 0
tan(2*x) = 0
tan(2*x) = 0 <=> 2*x = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
2*x-t_1 = 0
2*x-t_1 = 0 // + t_1
2*x = t_1 // : 2
x = t_1/2
x = pi*k_1/2 i k_1 należy do I
cos(2*x) = 0
cos(2*x) = 0
cos(2*x) = 0 <=> 2*x = pi*k_2+pi/2 i k_2 należy do I
t_2 = pi*k_2+pi/2
2*x-t_2 = 0
2*x-t_2 = 0 // + t_2
2*x = t_2 // : 2
x = t_2/2
x = pi*k_2+pi/2/2 i k_2 należy do I
x in {( -oo : +oo ) / {< pi*k_1/2 : pi*k_1/2 > U < pi*k_2+pi/2/2 : pi*k_2+pi/2/2 >}} i k_2 -> {I}, k_1 -> {I}
1/tan(2*x) = 0
1/tan(2*x) = 0 // * tan(2*x)
1 = 0
x belongs to the empty set
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