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D( x )
cos((1/2)*x) = 0
cos((1/2)*x) = 0
cos((1/2)*x) = 0
cos((1/2)*x) = 0 <=> (1/2)*x = pi*k_1+pi/2 i k_1 należy do I
t_1 = pi*k_1+pi/2
(1/2)*x-t_1 = 0
1/2*x-t_1 = 0 // + t_1
1/2*x = t_1 // : 1/2
x = t_1/1/2
x = 2*t_1
x = 2*pi*k_1+pi/2 i k_1 należy do I
x in {( -oo : +oo ) / < 2*pi*k_1+pi/2 : 2*pi*k_1+pi/2 >} i k_1 -> {I}
4*tan((1/2)*x) = 0
tan((1/2)*x) = 0
tan((1/2)*x) = 0 <=> (1/2)*x = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
(1/2)*x-t_1 = 0
1/2*x-t_1 = 0 // + t_1
1/2*x = t_1 // : 1/2
x = t_1/1/2
x = 2*t_1
x = 2*pi*k_1 i k_1 należy do I
4*tan((1/2)*x) = 0 <=> 4 = 0 or 4*tan((1/2)*x) = 0 <=> tan((1/2)*x) = 0
x = 2*pi*k_1
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