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Buktikan bahwa: a. coS (a + b) + cos (a - b) = 2 cos a cos

Saluran Edukasi
Saluran Edukasion 2024-07-11T12:51:43
Buktikan bahwa: a. coS (a + b) + cos (a - b) = 2 cos a cos
source: https://youtu.be/IUSJ6lW_1i0

Buktikan bahwa: a. coS (a + b) + cos (a - b) = 2 cos a cos b b. cos (a + b) -cos (a - b) =-2 sin a sin b

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