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kristinaalkhimi777
@kristinaalkhimi777
July 2022
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SOS!SOS! Тригонометрия !! Люди добрые ПОМОГИТЕ ! Вариант первый, номер 6,7 и 8. Для вашего и моего удобства напишите решение(если знаете) на листике и киньте фото:))) Ответы: на 2 фото вариант 1
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Universalka
Verified answer
Sin8x=- Sin2x
Sin8x + Sin2x= 0
Sin5x = 0 Cos3x = 0
5x = πn , n ∈ z 3x = π/2 + πn , n ∈ z
x = πn/5 , n ∈ z x = π/6 + πn/2 , n ∈ z
Sin160° - Sin100° + Sin40° = (Sin160° + Sin40°) - Sin100° =
= 2Sin100°Cos60° - Sin100° = 2 Sin100° * 1/2 - Sin100° =
= Sin100° - Sin100° = 0
2 votes
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Answers & Comments
Verified answer
Sin8x=- Sin2xSin8x + Sin2x= 0
Sin5x = 0 Cos3x = 0
5x = πn , n ∈ z 3x = π/2 + πn , n ∈ z
x = πn/5 , n ∈ z x = π/6 + πn/2 , n ∈ z
Sin160° - Sin100° + Sin40° = (Sin160° + Sin40°) - Sin100° =
= 2Sin100°Cos60° - Sin100° = 2 Sin100° * 1/2 - Sin100° =
= Sin100° - Sin100° = 0