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D( x )
cos((7*x)/12) = 0
cos((7*x)/12) = 0
cos((7*x)/12) = 0
cos((7*x)/12) = 0 <=> (7*x)/12 = pi*k_1+pi/2 i k_1 należy do I
t_1 = pi*k_1+pi/2
(7*x)/12-t_1 = 0
7/12*x-t_1 = 0 // + t_1
7/12*x = t_1 // : 7/12
x = t_1/7/12
x = 12/7*t_1
x = 12/7*pi*k_1+pi/2 i k_1 należy do I
x in {( -oo : +oo ) / < 12/7*pi*k_1+pi/2 : 12/7*pi*k_1+pi/2 >} i k_1 -> {I}
tan((7*x)/12) = 0
tan((7*x)/12) = 0 <=> (7*x)/12 = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
(7*x)/12-t_1 = 0
7/12*x-t_1 = 0 // + t_1
7/12*x = t_1 // : 7/12
x = t_1/7/12
x = 12/7*t_1
x = 12/7*pi*k_1 i k_1 należy do I
x = 12/7*pi*k_1
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