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D( x )
cos((7*x)/4) = 0
cos((7*x)/4) = 0
cos((7*x)/4) = 0
cos((7*x)/4) = 0 <=> (7*x)/4 = pi*k_1+pi/2 i k_1 należy do I
t_1 = pi*k_1+pi/2
(7*x)/4-t_1 = 0
7/4*x-t_1 = 0 // + t_1
7/4*x = t_1 // : 7/4
x = t_1/7/4
x = 4/7*t_1
x = 4/7*pi*k_1+pi/2 i k_1 należy do I
x in {( -oo : +oo ) / < 4/7*pi*k_1+pi/2 : 4/7*pi*k_1+pi/2 >} i k_1 -> {I}
tan((7*x)/4) = 0
tan((7*x)/4) = 0 <=> (7*x)/4 = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
(7*x)/4-t_1 = 0
7/4*x-t_1 = 0 // + t_1
7/4*x = t_1 // : 7/4
x = t_1/7/4
x = 4/7*t_1
x = 4/7*pi*k_1 i k_1 należy do I
x = 4/7*pi*k_1
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