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Nozhka
@Nozhka
July 2022
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Докажите, что cos(п/7) * cos(4п/7) * cos(5п/7)=1/4
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timothy3
Cos(5π/7) = -cos(2π/7)
- 8sin (π/7) * cos (π/7) * cos (2π/7) * cos (4π/7) = - sin (8π/7)
- sin (8π/7) / 8sin (π/7) = 1/8
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Answers & Comments
- 8sin (π/7) * cos (π/7) * cos (2π/7) * cos (4π/7) = - sin (8π/7)
- sin (8π/7) / 8sin (π/7) = 1/8