1 + 2.cos2 (− x ) + 2.sin2 (− x )

is gelijk aan
A.   1
B.   2
C.   3
D.   0
E.   − 1
A    B    C    D    E

[ 4-0388 - op net sinds 26.7.12-(E)-25.10.2023 ]

Translation in   E N G L I S H

1 + 2.cos2 (− x ) + 2.sin2 (− x )

is equal to
A.   1
B.   2
C.   3
D.   0
E.   − 1

Oplossing - Solution

1 + 2.cos2 (− x ) + 2.sin2 (− x ) = 1 + 2[cos²(−x) + sin²(−x)] = 1 + 2.1 = 1 + 2 = ...