Answer:
4) CD =DC = 1 is true .
Step-by-step explanation:
Given : If C and D are matrices and C is the inverse of D.
To find : which of the following is true.
Solution : We have given that C and D are matrices and C is the inverse of D.
By the inverse matrix rule : [tex]A^{}A^{-1} = [tex]A^{-1} A^{}[/tex]= 1[/tex].
Where [tex]A^{-1}[/tex] is inverse of A matrix .
Then CD =DC = 1
Therefore, 4) CD =DC = 1 is true .
