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