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sweetescape
@sweetescape
March 2022
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Помогайте,народ!!!
Докажите тождество :
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Lesben
Sin(a-b)=sinacosb-cosasinb
cos(a+b)=cosacosb -sinasinb
sin(pí/6-a)-cos(pí/3+a)=sinpí/6.cosa - cospí/6sina -cospí/3cosa+sinpí/3sina=
=1/2cosa -V3/2sina-1/2cosa+V3/2.sina=0
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sweetescape
Поможешь?
Ellenochka
Через тригонометрическую формулу суммы/разности углов:
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Answers & Comments
cos(a+b)=cosacosb -sinasinb
sin(pí/6-a)-cos(pí/3+a)=sinpí/6.cosa - cospí/6sina -cospí/3cosa+sinpí/3sina=
=1/2cosa -V3/2sina-1/2cosa+V3/2.sina=0