Matematika

Pertanyaan

nilai 10 cos 20° cos 40° cos 80° adalah

1 Jawaban

  • = 10 cos (20°)*cos(40°)*cos (80°) 
    = (10)*((cos (20° + 40°) + cos (20° - 40°))/2)*cos (80°)
    = (10)*((cos (60°) + cos (-20°))/2) * cos (80°)
    = (10 cos (80°))*((cos (60°) + cos (-20°))/2
    = 5 cos (80°)*((cos (60°) + cos (-20°))
    = 5 cos (80°)*((cos (60°) + cos (20°))
    = 5 cos (80°)*(1/2 + cos (20°))




    10 cos 20° cos 40
    ° cos 80° =

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