(cos α + sin α)2
is gelijk aan
A.  1
B.  1 + 2.sin 2α
C.  1 + sin 2α
D.  1 + 2.sin 2α
E.  1 + cos 2α
A    B    C    D    E

[ 5-0658 - op net sinds 5.4.2020-(E)-8.11.2023 ]

Translation in   E N G L I S H

(cos α + sin α)2
is equal to
A.   1
B.   1 + 2(sin 2α)
C.   1 + sin 2α
D.   1 + 2(sin 2α)
E.   1 + cos 2α

Oplossing - Solution

(cos α + sin α)² = cos² α + 2.cos α.sin α + sin² α = 1 + 2.sin α.cos α = . . .
gricha