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Röyskope
@Röyskope
August 2022
1
23
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Упростите: sin(3п/5)*sin(7п/5) - cos(7п/5)*cos(3п/5)
а) 0
б) -1
в) -cos(п/5)
г) 1
д) sin(п/5)
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Answers & Comments
gfirsov0071
Вспомним формулу: cos(α + β) = cosαcosβ - sinαsinβ
- (cos(7π/5)cos(3π/5) - sin(7π/5)sin(3π/5)) = -cos(π/2) = 0
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Röyskope
Спасибо!
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Answers & Comments
- (cos(7π/5)cos(3π/5) - sin(7π/5)sin(3π/5)) = -cos(π/2) = 0