Основные формулы:
[tex]\sin^2\beta +\cos^2\beta =1\Rightarrow 1-\cos^2\beta=\sin^2\beta[/tex]
[tex]\mathrm{tg}\,\beta\, \mathrm{ctg}\,\beta =1[/tex]
Преобразуем:
[tex]3\,\mathrm{tg}\,a\cdot\mathrm{ctg}\,a - 3\cos^2x=3\cdot1-3\cos^2x=3(1-\cos^2x)=3\sin^2x[/tex]
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Основные формулы:
[tex]\sin^2\beta +\cos^2\beta =1\Rightarrow 1-\cos^2\beta=\sin^2\beta[/tex]
[tex]\mathrm{tg}\,\beta\, \mathrm{ctg}\,\beta =1[/tex]
Преобразуем:
[tex]3\,\mathrm{tg}\,a\cdot\mathrm{ctg}\,a - 3\cos^2x=3\cdot1-3\cos^2x=3(1-\cos^2x)=3\sin^2x[/tex]