(
1− sinx
)
.
(
1− sin(− x )
) =
A. 1
B. (1 + sin x)
2
C. cos
2
x
D. (1 − sin x)
2
E. − cos
2
x
[ 4-4793 - op net sinds 6.7.07-(E)-24.10.2023 ]
Translation in E N G L I S H
(
1− sinx
)
.
(
1− sin(− x )
) =
A. 1
B.
C.
D.
E.
Oplossing - Solution
(
1− sinx
)
.
(
1− sin(− x )
) =
(1 − sin x).(1 + sin x) = 1 − sin² x = cos² x
