tex] b...

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Помогите по алгебре 9 класс. Очень нужно! Спасибо всем
Разложите на множители:
1. 1+cos b+cos [tex] \frac{b}{2} [/tex]
2. 3- [tex] tg^{2} [/tex]b
3. 3-4[tex] sin^{{2} [/tex] b

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Rechnung

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$1) 1+cos \beta +cos \beta /2=(1+cos \beta )+cos \beta /2=\\=(sin^2 \beta /2+cos^2 \beta /2+cos(2* \beta /2))+cos \beta /2=\\=sin^2 \beta /2+cos^2 \beta /2+cos^2 \beta /2-sin^2 \beta /2)+cos \beta /2=\\=2cos \beta /2+cos \beta /2=cos \beta /2*(2cos \beta /2+1)\\\\2)3-tg^2 \beta =( \sqrt{3}-tg \beta )( \sqrt{3}+tg \beta )\\\\3)3-4sin^2 \beta =( \sqrt{3}-2sin \beta )( \sqrt{3}+2sin \beta )$

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