Buktikan cos x-cos 3x+cos 5x+cos 7x=-4 cos 4x.sin 2x.sin x

Name: Buktikan cos x-cos 3x+cos 5x+cos 7x=-4 cos 4x.sin 2x.sin x
Uploaded: 2024-05-07T01:01:43
Duration: PT2M2.867S
Description: Buktikan cos x-cos 3x+cos 5x+cos 7x=-4 cos 4x.sin 2x.sin x