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Anika004323444
@Anika004323444
July 2022
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Здравствуйте,подскажите решение.21sin113cos113/sin226
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tseluyko58
Verified answer
21sin113cos113/sin226=10,5*(2sin113cos113)/sin226=10,5*sin226/sin226=10,5
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Anika004323444
спасибо большое,решила,а с ответом сомневаюсь (
а вот 5sin11п/12cos11П/12
это же тоже формула двойного угла ?
tseluyko58
Да
Anika004323444
и получается 2,5sin22п/24??
Anika004323444
т.е 2,5sin2п/6
tseluyko58
2,5sin22П/12=2,5sin11П/6=2,5sin(П-П/6)=2,5sinП/6=2,5*1/2=1,25
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Verified answer
21sin113cos113/sin226=10,5*(2sin113cos113)/sin226=10,5*sin226/sin226=10,5а вот 5sin11п/12cos11П/12
это же тоже формула двойного угла ?