(1 + sinx).[1 + sin(− x )] = A.    1
B.   (1 + sin x)2
C.   cos2x
D.   (1 − sin x)2
E.   − cos2 x
   ;     ;     ;     ;   

[ 4-4513 - op net sinds 13.1.05-()-29.10.2023 ]

Translation in   E N G L I S H

See above

Oplossing - Solution

(1 + sinx).[1 + sin(−x)] = (1 + sinx).(1 − sinx) = 1 − sin² x = cos² x