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