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D( x )
sin(11*x) = 0
sin(11*x) = 0
sin(11*x) = 0
sin(11*x) = 0 <=> 11*x = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
11*x-t_1 = 0
11*x-t_1 = 0 // + t_1
11*x = t_1 // : 11
x = t_1/11
x = pi*k_1/11 i k_1 należy do I
x in {( -oo : +oo ) / < pi*k_1/11 : pi*k_1/11 >} i k_1 -> {I}
sin(7*x)/sin(11*x) = 0
sin(7*x)/sin(11*x) = 0 // * sin(11*x)
sin(7*x) = 0
sin(7*x) = 0 <=> 7*x = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
7*x-t_1 = 0
7*x-t_1 = 0 // + t_1
7*x = t_1 // : 7
x = t_1/7
x = pi*k_1/7 i k_1 należy do I
x = pi*k_1/7
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