sin^4 a -sin^2a=cos^4a-cos^2a

sin^4 a -sin^2a=cos^4a-cos^2a
- Предмет:
  Алгебра
- Автор:
  brindleiiv0
- 6 лет назад

Ответы 1

$sin^4 \alpha -sin^2 \alpha =cos^4 \alpha -cos^2 \alpha \\sin^2 \alpha (sin^2 \alpha -1)=cos^2 \alpha (cos^2 \alpha -1)\\sin^2 \alpha *(-cos^2 \alpha )=cos^2 \alpha (-sin^2 \alpha )\\-sin^2 \alpha cos^2 \alpha =-sin^2 \alpha cos^2 \alpha \\-sin^2 \alpha cos^2 \alpha-(-sin^2 \alpha cos^2 \alpha )=sin^2 \alpha cos^2 \alpha -sin^2 \alpha cos^2 \alpha =0\\0=0$
- Автор:
  cullenhebert
- 6 лет назад
- 0
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sin^4 a -sin^2a=cos^4a-cos^2a

Ответы 1

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