D cos2x = A.   − 2.sin x
B.   − sin 2x
C.   2.cos x
D.   sin2x
E.   − sin2x
A    B    C    D    E

[ 5-2896 - op net sinds 2.7.03-(E)-29.10.2023 ]

Translation in   E N G L I S H

D cos2x = A.   − 2.sin x
B.   − sin 2x
C.   2.cos x
D.   sin2x
E.   − sin2x

Oplossing - Solution

D cos² x = 2.cos x.D(cos x) = 2.cos x.(−sin x)
    = −2.sin x.cos x = −sin 2x
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