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D( x )
21*c^5 = 0
((28*c^-7*d^3)/(21*c^5))*d^7 = 0
21*c^5 = 0
21*c^5 = 0
21*c^5 = 0
x należy do R
((28*c^-7*d^3)/(21*c^5))*d^7 = 0
((28*c^-7*d^3)/(21*c^5))*d^7 = 0
4/3*c^-12*d^10 = 0
x należy do R
x belongs to the empty set
(((28*c^-7*d^3)/(21*c^5))*d^7)^-2 = 0
x belongs to the empty set
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