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Identitas trigonometri berikut : 6 cos 40° cos 30° = 3 (cos 70° +cos 10°)

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  • 6 cos 40° cos 30° = 3 (cos 70°+cos 10°)
    3(cos (40°+30°) + cos (40°-30°)=3(cos70°+cos10°)
    3( cos70°+ cos10°)= 3(cos70°+ cos 10°)

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