sin (90° + α) =
A. cos α
B. cos (90° + α)
C. cos (α − 90°)
D. − sin α
E. sin (α − 90°)
F. − cos α
[ 4-0557 - op net sinds 4.11.10-(E)-3.11.2023 ]
Translation in E N G L I S H
see above
Oplossing - Solution
sin(90° + α) = cos[90° − (90° − α)] = cos[90° − 90° + α] = cos α
