3.sin 2 3x + 3.cos 2 3x   = A.   1
B.   2
C.   3
D.   9
E.   27
A    B    C    D    E 

[ 4-0241 - op net sinds 22.12.97-(E)-29.10.2023 ]

Translation in   E N G L I S H

IN CONSTRUCTION

Oplossing - Solution

3.sin² 3x + 3.cos² 3x = 3.(sin² 3x + cos² 3x) = 3.1 = 3
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