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D( x )
cos((5*x)/6) = 0
cos((5*x)/6) = 0
cos((5*x)/6) = 0
cos((5*x)/6) = 0 <=> (5*x)/6 = pi*k_1+pi/2 i k_1 należy do I
t_1 = pi*k_1+pi/2
(5*x)/6-t_1 = 0
5/6*x-t_1 = 0 // + t_1
5/6*x = t_1 // : 5/6
x = t_1/5/6
x = 6/5*t_1
x = 6/5*pi*k_1+pi/2 i k_1 należy do I
x in {( -oo : +oo ) / < 6/5*pi*k_1+pi/2 : 6/5*pi*k_1+pi/2 >} i k_1 -> {I}
tan((5*x)/6) = 0
tan((5*x)/6) = 0 <=> (5*x)/6 = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
(5*x)/6-t_1 = 0
5/6*x-t_1 = 0 // + t_1
5/6*x = t_1 // : 5/6
x = t_1/5/6
x = 6/5*t_1
x = 6/5*pi*k_1 i k_1 należy do I
x = 6/5*pi*k_1
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