Question

Упростите:
$frac{ sin(2 alpha ) }{ 1 + cos(2 alpha ) }$
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Answer 1

Ответ: tgα

Объяснение:

$displaystyle frac{sin2alpha}{1+cos2alpha}=frac{2sinalphacosalpha}{1+2cos^2alpha-1}=frac{2sinalphacosalpha}{2cos^2alpha}=frac{sinalpha}{cosalpha}={rm tg},alpha$