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