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Buktikan bahwa: a. cos 2a cos a+sin 2a sin a=cos a b. cos

Saluranedukasi
Saluranedukasion 2024-03-03T14:31:43
Buktikan bahwa: a. cos 2a cos a+sin 2a sin a=cos a b. cos
source: https://youtu.be/Vilip6vM19s

Buktikan bahwa: a. cos 2a cos a+sin 2a sin a=cos a b. cos 3x cos 2x-sin 3x sin 2x=cos 5x c. cos(30+p)cos(3-p)-sin(30+p)sin(30-p)=1/2

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