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Svetka1monetka
@Svetka1monetka
July 2022
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Решите, пожалуйста, под буквой "а" !
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mikael2
Verified answer
Sinxcos3x+cosxsin3x=sin(x+3x)=sin4x>1/2
2/3π+2πn >4x>π/3+2πn
1/6π+πn/2>x>π/12+πn/2 n∈Z
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Svetka1monetka
Извините, можете объяснить, как перешли ко второй строке?
Svetka1monetka
С первой понятно
Svetka1monetka
1/2 это синус п/6 , а не п/3, как у вас!
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Answers & Comments
Verified answer
Sinxcos3x+cosxsin3x=sin(x+3x)=sin4x>1/22/3π+2πn >4x>π/3+2πn
1/6π+πn/2>x>π/12+πn/2 n∈Z