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elya0000
@elya0000
July 2022
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тригонометрия ! срочно ! под номером 6 доказать тождество !КАРТИНКА ВНУТРИ
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sedinalana
Verified answer
A)tg2a*3ctg2a=3
3=3
2tga/(1-tg²a)=tg2a
tg2a*ctg2a=1
b)cos(3a-a)/(sina+cosa)=cos2a/(sina+cosa)=(cos²a-sin²a)/(sina+cosa)=
=(cosa-sina)(sina+cosa)/
(sina+cosa)=cosa-sina
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Verified answer
A)tg2a*3ctg2a=33=3
2tga/(1-tg²a)=tg2a
tg2a*ctg2a=1
b)cos(3a-a)/(sina+cosa)=cos2a/(sina+cosa)=(cos²a-sin²a)/(sina+cosa)=
=(cosa-sina)(sina+cosa)/(sina+cosa)=cosa-sina