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Buktikan bahwa: cos 2 a(1+cos a)=cos a+cos 2 a+cos 3 a

Saluranedukasi
Saluranedukasion 2024-01-21T00:12:00.000Z
Buktikan bahwa: cos 2 a(1+cos a)=cos a+cos 2 a+cos 3 a
source: https://youtu.be/eWblFEgnwxk

Buktikan bahwa: cos 2 a(1+cos a)=cos a+cos 2 a+cos 3 a

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