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D( X )
cos(X/20) = 0
cos(X/20) = 0
cos(X/20) = 0
cos(X/20) = 0 <=> X/20 = pi*k_1+pi/2 i k_1 należy do I
t_1 = pi*k_1+pi/2
X/20-t_1 = 0
1/20*X-t_1 = 0 // + t_1
1/20*X = t_1 // : 1/20
X = t_1/1/20
X = 20*t_1
X = 20*pi*k_1+pi/2 i k_1 należy do I
X in {( -oo : +oo ) / < 20*pi*k_1+pi/2 : 20*pi*k_1+pi/2 >} i k_1 -> {I}
-4*tan(X/20) = 0
tan(X/20) = 0
tan(X/20) = 0 <=> X/20 = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
X/20-t_1 = 0
1/20*X-t_1 = 0 // + t_1
1/20*X = t_1 // : 1/20
X = t_1/1/20
X = 20*t_1
X = 20*pi*k_1 i k_1 należy do I
-4*tan(X/20) = 0 <=> -4 = 0 or -4*tan(X/20) = 0 <=> tan(X/20) = 0
X = 20*pi*k_1
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