− sinx = A.   cos (180° + x)
B.   cos (180° − x)
C.   cos (90° − x)
D.   cos (270° − x)
E.   cos (270° + x)
A    B    C    D    E

[ 4-5093 - op net sinds 13.5.13-(E)-29.10.2023 ]

Translation in   E N G L I S H

− sinx = A.  cos (180° + x)
B.  cos (180° − x)
C.  cos (90° − x)
D.  cos (270° − x)
E.  cos (270° + x)

Oplossing - Solution

cos (270° − x) = cos (− 90° − x) = cos (90° + x) = sin (90° − 90° − x) = sin (− x) = − sin x
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