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21. The argument of the complex number 0 is ?
(A) 0
(B) 1
(C) ln1
(D) not define

22. If

is invertible under matrix multiplication, then its inverse is?

24. Which of the following equation represents the Green’s theorem?

25. What is the multiplicative identity of the complex number (x,y) ?
(A) (–x,–y)
(B) (x^–1,y^–1)
(C) (1,0)
(D) (0,1)