(x y)
−1
.(x y
−1
)
is gelijk aan
A. 1
B. 2xy
C. y
2
D. y
− 2
E. none of the above
[ 3-0842 - op net sinds 6-7-98-(E)-29.10.2023 ]
Translation in E N G L I S H
(x y)
-1
.(x y
-1
)
equals
A. 1
B. 2xy
C. y
2
D. y
− 2
E. none of the above
Oplossing - Solution
(xy)
−1
.(xy
−1
) = x
−1
y
−1
xy
−1
= y
−2
