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speedyspeedovsk
@speedyspeedovsk
July 2022
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Решить уравнение:
[tex]sinxsin3x+sin4xsin8x=0[/tex]
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Universalka
Verified answer
[Cos(x-3x) - Cos(x+3x)]/2 + [Cos(4x-8x) - Cos(4x+8x)]/2 = 0
Cos2x - Cos4x + Cos4x - Cos12x= 0
Cos2x - Cos12x = 0
- 2 Sin[(2x + 12x)/2]Sin[(2x - 12x)/2]= 0
Sin7xSin5x = 0
Sin7x = 0
7x = Пn, n э z
x = Пn/7, n э z
Sin5x = 0
5x = Пn, n э z
x = Пn/5, nэ z
Ответ: Пn/5, Пn/7, n э z
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Answers & Comments
Verified answer
[Cos(x-3x) - Cos(x+3x)]/2 + [Cos(4x-8x) - Cos(4x+8x)]/2 = 0Cos2x - Cos4x + Cos4x - Cos12x= 0
Cos2x - Cos12x = 0
- 2 Sin[(2x + 12x)/2]Sin[(2x - 12x)/2]= 0
Sin7xSin5x = 0
Sin7x = 0
7x = Пn, n э z
x = Пn/7, n э z
Sin5x = 0
5x = Пn, n э z
x = Пn/5, nэ z
Ответ: Пn/5, Пn/7, n э z