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D( x )
cos((3/2)*x-pi) = 0
cos((3/2)*x-pi) = 0
cos((3/2)*x-pi) = 0
cos((3/2)*x-pi) = 0 <=> (3/2)*x-pi = pi*k_1+pi/2 i k_1 należy do I
t_1 = pi*k_1+pi/2
(3/2)*x-t_1-pi = 0
3/2*x-t_1-pi = 0 // + -t_1-pi
3/2*x = -(-t_1-pi) // : 3/2
x = (-(-t_1-pi))/3/2
x = 2/3*(t_1+pi)
x = 2/3*(pi*k_1+pi/2+pi) i k_1 należy do I
x in {( -oo : +oo ) / < 2/3*(pi*k_1+pi/2+pi) : 2/3*(pi*k_1+pi/2+pi) >} i k_1 -> {I}
tan((3/2)*x-pi) = 0
tan((3/2)*x-pi) = 0 <=> (3/2)*x-pi = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
(3/2)*x-t_1-pi = 0
3/2*x-t_1-pi = 0 // + -t_1-pi
3/2*x = -(-t_1-pi) // : 3/2
x = (-(-t_1-pi))/3/2
x = 2/3*(t_1+pi)
x = 2/3*(pi*k_1+pi) i k_1 należy do I
x = 2/3*(pi*k_1+pi)
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