Предмет: Геометрия, автор: Иришка58

Помогите пожалуйста с геометрией очень срочно надо

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Ответы

Автор ответа: aigul0799

1+соs2a+2sin^2a=2
1+ cos^2a-sin^2a+2sin^a=2
1+1=2
2=2.

2 sin660= 2sin(720-60)=2sin60=2 × √3/2= √3
3tg765=3tg(720+45) 3×1=3

tg=15/8
1+tg^2=1/sin^2
1+225/64=1/sin^2
289/64=1/sin^2
289 sin^2= 64
sin^2= 64/289
sina=8/17

1-sin^2=cos^2a
cos^2=1- 64/289
cos^2= 225/289
cosa=15/17

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