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