De oplossingen-
verzameling
van   cos 6x = − 0,5
 A.  { ± 5° + k.60°}
B.  { ± 10° + k.60°}
C.  { 15° + k.30°}
D.  { ± 20° + k.60°}
E.  { ± 25° + k.60°}
A    B    C    D    E

[ 5-3732 - op net sinds 25.7.2020-()-24.10.2023 ]

Translation in   E N G L I S H

IN CONSTRUCTION

Oplossing - Solution

  cos 6x = − 0,5 = − cos 60° = cos 120°
 ⇔  6x = ±120° +k.360°
 ⇔  x = ±20° + k.60°
gricha